carbon/README.md

# Carbon

[![Carbon Release](https://img.shields.io/github/release/golang-module/carbon.svg)](https://github.com/golang-module/carbon/releases)
[![Go Test](https://github.com/golang-module/carbon/actions/workflows/test.yml/badge.svg)](https://github.com/golang-module/carbon/actions)
[![Go Report Card](https://goreportcard.com/badge/github.com/golang-module/carbon/v2)](https://goreportcard.com/report/github.com/golang-module/carbon/v2)
[![Go Coverage](https://codecov.io/gh/golang-module/carbon/branch/master/graph/badge.svg)](https://codecov.io/gh/golang-module/carbon)
[![Carbon Doc](https://img.shields.io/badge/go.dev-reference-brightgreen?logo=go&logoColor=white&style=flat)](https://pkg.go.dev/github.com/golang-module/carbon)
![License](https://img.shields.io/github/license/golang-module/carbon)

English | [简体中文](README.cn.md) | [日本語](README.jp.md)

#### Introduction

A simple, semantic, zero dependency and developer-friendly golang package for datetime, has been included
by [awesome-go](https://github.com/avelino/awesome-go#date-and-time "awesome-go")

[github.com/golang-module/carbon](https://github.com/golang-module/carbon "github.com/golang-module/carbon")

[gitee.com/golang-module/carbon](https://gitee.com/golang-module/carbon "gitee.com/golang-module/carbon")

#### Installation

##### Go version >= 1.16 (recommend)

```go
// By github
go get -u github.com/golang-module/carbon/v2

import "github.com/golang-module/carbon/v2"

// By gitee
go get -u gitee.com/golang-module/carbon/v2

import "gitee.com/golang-module/carbon/v2"
```

##### Go version < 1.16 (must)

```go
// By github
go get -u github.com/golang-module/carbon

import "github.com/golang-module/carbon"

// By gitee
go get -u gitee.com/golang-module/carbon

import "gitee.com/golang-module/carbon"
```

> Please refer to <a href="#faq">FAQ</a> for the difference between v1 and v2, v1 is no longer updated, only maintained.

#### Usage and example

> The default timezone is Local, assuming the current time is 2020-08-05 13:14:15.999999999 +0800 CST

##### Yesterday, today and tomorrow

```go
// Return datetime of today
fmt.Sprintf("%s", carbon.Now()) // 2020-08-05 13:14:15
carbon.Now().String() // 2020-08-05 13:14:15
carbon.Now().ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Now().ToDateTimeString() // 2020-08-05 13:14:15
// Return date of today
carbon.Now().ToDateString() // 2020-08-05
// Return time of today
carbon.Now().ToTimeString() // 13:14:15
// Return datetime of today in a given timezone
carbon.Now(Carbon.NewYork).ToDateTimeString() // 2020-08-05 14:14:15
// Return timestamp with second of today
carbon.Now().Timestamp() // 1596604455
// Return timestamp with millisecond of today
carbon.Now().TimestampMilli() // 1596604455999
// Return timestamp with microsecond of today
carbon.Now().TimestampMicro() // 1596604455999999
// Return timestamp with nanosecond of today
carbon.Now().TimestampNano() // 1596604455999999999

// Return datetime of yesterday
fmt.Sprintf("%s", carbon.Yesterday()) // 2020-08-04 13:14:15
carbon.Yesterday().String() // 2020-08-04 13:14:15
carbon.Yesterday().ToString() // 2020-08-04 13:14:15 +0800 CST
carbon.Yesterday().ToDateTimeString() // 2020-08-04 13:14:15
// Return date of yesterday
carbon.Yesterday().ToDateString() // 2020-08-04
// Return time of yesterday
carbon.Yesterday().ToTimeString() // 13:14:15
// Return datetime of yesterday on a given day
carbon.Parse("2021-01-28 13:14:15").Yesterday().ToDateTimeString() // 2021-01-27 13:14:15
// Return datetime of yesterday in a given timezone
carbon.Yesterday(Carbon.NewYork).ToDateTimeString() // 2020-08-04 14:14:15
// Return timestamp with second of yesterday
carbon.Yesterday().Timestamp() // 1596518055
// Return timestamp with millisecond of yesterday
carbon.Yesterday().TimestampMilli() // 1596518055999
// Return timestamp with microsecond of yesterday
carbon.Yesterday().TimestampMicro() // 1596518055999999
// Return timestamp with nanosecond of yesterday
carbon.Yesterday().TimestampNano() // 1596518055999999999

// Return datetime of tomorrow
fmt.Sprintf("%s", carbon.Tomorrow()) // 2020-08-06 13:14:15
carbon.Tomorrow().String() // 2020-08-06 13:14:15
carbon.Tomorrow().ToString() // 2020-08-06 13:14:15 +0800 CST
carbon.Tomorrow().ToDateTimeString() // 2020-08-06 13:14:15
// Return date of tomorrow
carbon.Tomorrow().ToDateString() // 2020-08-06
// Return time of tomorrow
carbon.Tomorrow().ToTimeString() // 13:14:15
// Return datetime of tomorrow on a given day
carbon.Parse("2021-01-28 13:14:15").Tomorrow().ToDateTimeString() // 2021-01-29 13:14:15
// Return datetime of tomorrow in a given timezone
carbon.Tomorrow(Carbon.NewYork).ToDateTimeString() // 2020-08-06 14:14:15
// Return timestamp with second of tomorrow
carbon.Tomorrow().Timestamp() // 1596690855
// Return timestamp with millisecond of tomorrow
carbon.Tomorrow().TimestampMilli() // 1596690855999
// Return timestamp with microsecond of tomorrow
carbon.Tomorrow().TimestampMicro() // 1596690855999999
// Return timestamp with nanosecond of tomorrow
carbon.Tomorrow().TimestampNano() // 1596690855999999999
```

##### Create a Carbon instance

```go
// Create a Carbon instance from a given timestamp with second
carbon.CreateFromTimestamp(-1).ToString() // 1970-01-01 07:59:59 +0800 CST
carbon.CreateFromTimestamp(0).ToString() // 1970-01-01 08:00:00 +0800 CST
carbon.CreateFromTimestamp(1).ToString() // 1970-01-01 08:00:01 +0800 CST
carbon.CreateFromTimestamp(1649735755).ToString() // 2022-04-12 11:55:55 +0800 CST
// Create a Carbon instance from a given timestamp with millisecond
carbon.CreateFromTimestampMilli(1649735755981).ToString() // 2022-04-12 11:55:55.981 +0800 CST
// Create a Carbon instance from a given timestamp with microsecond
carbon.CreateFromTimestampMicro(1649735755981566).ToString() // 2022-04-12 11:55:55.981566 +0800 CST
// Create a Carbon instance from a given timestamp with nanosecond
carbon.CreateFromTimestampNano(1649735755981566000).ToString() // 2022-04-12 11:55:55.981566 +0800 CST

// Create a Carbon instance from a given date and time
carbon.CreateFromDateTime(2020, 8, 5, 13, 14, 15).ToString() // 2020-08-05 13:14:15 +0800 CST
// Create a Carbon instance from a given date and time with millisecond
carbon.CreateFromDateTimeMilli(2020, 8, 5, 13, 14, 15, 999).ToString() // 2020-08-05 13:14:15.999 +0800 CST
// Create a Carbon instance from a given date and time with microsecond
carbon.CreateFromDateTimeMicro(2020, 8, 5, 13, 14, 15, 999999).ToString() // 2020-08-05 13:14:15.999999 +0800 CST
// Create a Carbon instance from a given date and time with nanosecond
carbon.CreateFromDateTimeNano(2020, 8, 5, 13, 14, 15, 999999999).ToString() // 2020-08-05 13:14:15.999999999 +0800 CST

// Create a Carbon instance from a given year, month and day
carbon.CreateFromDate(2020, 8, 5).ToString() // // 2020-08-05 13:14:15 +0800 CST
// Create a Carbon instance from a given year, month and day with millisecond
carbon.CreateFromDateMilli(2020, 8, 5, 999).ToString() // 2020-08-05 13:14:15.999 +0800 CST
// Create a Carbon instance from a given year, month and day with microsecond
carbon.CreateFromDateMicro(2020, 8, 5, 999999).ToString() // 2020-08-05 13:14:15.999999 +0800 CST
// Create a Carbon instance from a given year, month and day with nanosecond
carbon.CreateFromDateNano(2020, 8, 5, 999999999).ToString() // 2020-08-05 13:14:15.999999999 +0800 CST

// Create a Carbon instance from a given hour, minute and second
carbon.CreateFromTime(13, 14, 15).ToString() // 2020-08-05 13:14:15 +0800 CST
// Create a Carbon instance from a given hour, minute and second with millisecond
carbon.CreateFromTimeMilli(13, 14, 15, 999).ToString() // 2020-08-05 13:14:15.999 +0800 CST
// Create a Carbon instance from a given hour, minute and second with microsecond
carbon.CreateFromTimeMicro(13, 14, 15, 999999).ToString() // 2020-08-05 13:14:15.999999 +0800 CST
// Create a Carbon instance from a given hour, minute and second with nanosecond
carbon.CreateFromTimeNano(13, 14, 15, 999999999).ToString() // 2020-08-05 13:14:15.999999999 +0800 CST
```

##### Parse a time string as a Carbon instance

```go
carbon.Parse("").ToDateTimeString() // empty string
carbon.Parse("0").ToDateTimeString() // empty string
carbon.Parse("00:00:00").ToDateTimeString() // empty string
carbon.Parse("0000-00-00").ToDateTimeString() // empty string
carbon.Parse("0000-00-00 00:00:00").ToDateTimeString() // empty string

carbon.Parse("now").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("yesterday").ToString() // 2020-08-04 13:14:15 +0800 CST
carbon.Parse("tomorrow").ToString() // 2020-08-06 13:14:15 +0800 CST

carbon.Parse("2020").ToString() // 2020-01-01 00:00:00 +0800 CST
carbon.Parse("2020-8").ToString() // 2020-08-01 00:00:00 +0800 CST
carbon.Parse("2020-08").ToString() // 2020-08-01 00:00:00 +0800 CST
carbon.Parse("2020-8-5").ToString() // 2020-08-05 00:00:00 +0800 CST
carbon.Parse("2020-8-05").ToString() // 2020-08-05 00:00:00 +0800 CST
carbon.Parse("2020-08-05").ToString() // 2020-08-05 00:00:00 +0800 CST
carbon.Parse("2020-08-05.999").ToString() // 2020-08-05 00:00:00.999 +0800 CST
carbon.Parse("2020-08-05.999999").ToString() // 2020-08-05 00:00:00.999999 +0800 CST
carbon.Parse("2020-08-05.999999999").ToString() // 2020-08-05 00:00:00.999999999 +0800 CST

carbon.Parse("2020-8-5 13:14:15").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-8-05 13:14:15").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-08-5 13:14:15").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-08-05 13:14:15").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-08-05 13:14:15.999").ToString() // 2020-08-05 13:14:15.999 +0800 CST
carbon.Parse("2020-08-05 13:14:15.999999").ToString() // 2020-08-05 13:14:15.999999 +0800 CST
carbon.Parse("2020-08-05 13:14:15.999999999").ToString() // 2020-08-05 13:14:15.999999999 +0800 CST

carbon.Parse("2020-8-5T13:14:15+08:00").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-8-05T13:14:15+08:00").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-08-05T13:14:15+08:00").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("2020-08-05T13:14:15.999+08:00").ToString() // 2020-08-05 13:14:15.999 +0800 CST
carbon.Parse("2020-08-05T13:14:15.999999+08:00").ToString() // 2020-08-05 13:14:15.999999 +0800 CST
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToString() // 2020-08-05 13:14:15.999999999 +0800 CST

carbon.Parse("20200805").ToString() // 2020-08-05 00:00:00 +0800 CST
carbon.Parse("20200805131415").ToString() // 2020-08-05 13:14:15 +0800 CST
carbon.Parse("20200805131415.999").ToString() // 2020-08-05 13:14:15.999 +0800 CST
carbon.Parse("20200805131415.999999").ToString() // 2020-08-05 13:14:15.999999 +0800 CST
carbon.Parse("20200805131415.999999999").ToString() // 2020-08-05 13:14:15.999999999 +0800 CST
carbon.Parse("20200805131415.999+08:00").ToString() // 2020-08-05 13:14:15.999 +0800 CST
carbon.Parse("20200805131415.999999+08:00").ToString() // 2020-08-05 13:14:15.999999 +0800 CST
carbon.Parse("20200805131415.999999999+08:00").ToString() // 2020-08-05 13:14:15.999999999 +0800 CST
```

##### Parse a time string as a Carbon instance by format

```go
carbon.ParseByFormat("2020|08|05 13|14|15", "Y|m|d H|i|s").ToDateTimeString() // 2020-08-05 13:14:15
carbon.ParseByFormat("It is 2020-08-05 13:14:15", "\\I\\t \\i\\s Y-m-d H:i:s").ToDateTimeString() // 2020-08-05 13:14:15
carbon.ParseByFormat("今天是 2020年08月05日13时14分15秒", "今天是 Y年m月d日H时i分s秒").ToDateTimeString() // 2020-08-05 13:14:15
```

##### Parse a time string as a Carbon instance by layout

```go
carbon.ParseByLayout("2020|08|05 13|14|15", "2006|01|02 15|04|05").ToDateTimeString() // 2020-08-05 13:14:15
carbon.ParseByLayout("It is 2020-08-05 13:14:15", "It is 2006-01-02 15:04:05").ToDateTimeString() // 2020-08-05 13:14:15
carbon.ParseByLayout("今天是 2020年08月05日13时14分15秒", "今天是 2006年01月02日15时04分05秒").ToDateTimeString() // 2020-08-05 13:14:15
```

##### Convert between Carbon and Time

```go
// Convert Time.time into Carbon
carbon.CreateFromStdTime(time.Now())
// Convert Carbon into Time.time
carbon.Now().ToStdTime()
```

##### Start and end

```go
// Start of the century
carbon.Parse("2020-08-05 13:14:15").StartOfCentury().ToDateTimeString() // 2000-01-01 00:00:00
// End of the century
carbon.Parse("2020-08-05 13:14:15").EndOfCentury().ToDateTimeString() // 2999-12-31 23:59:59

// Start of the decade
carbon.Parse("2020-08-05 13:14:15").StartOfDecade().ToDateTimeString() // 2020-01-01 00:00:00
carbon.Parse("2021-08-05 13:14:15").StartOfDecade().ToDateTimeString() // 2020-01-01 00:00:00
carbon.Parse("2029-08-05 13:14:15").StartOfDecade().ToDateTimeString() // 2020-01-01 00:00:00
// End of the decade
carbon.Parse("2020-08-05 13:14:15").EndOfDecade().ToDateTimeString() // 2029-12-31 23:59:59
carbon.Parse("2021-08-05 13:14:15").EndOfDecade().ToDateTimeString() // 2029-12-31 23:59:59
carbon.Parse("2029-08-05 13:14:15").EndOfDecade().ToDateTimeString() // 2029-12-31 23:59:59

// Start of the year
carbon.Parse("2020-08-05 13:14:15").StartOfYear().ToDateTimeString() // 2020-01-01 00:00:00
// End of the year
carbon.Parse("2020-08-05 13:14:15").EndOfYear().ToDateTimeString() // 2020-12-31 23:59:59

// Start of the quarter
carbon.Parse("2020-08-05 13:14:15").StartOfQuarter().ToDateTimeString() // 2020-07-01 00:00:00
// End of the quarter
carbon.Parse("2020-08-05 13:14:15").EndOfQuarter().ToDateTimeString() // 2020-09-30 23:59:59

// Start of the month
carbon.Parse("2020-08-05 13:14:15").StartOfMonth().ToDateTimeString() // 2020-08-01 00:00:00
// End of the month
carbon.Parse("2020-08-05 13:14:15").EndOfMonth().ToDateTimeString() // 2020-08-31 23:59:59

// Start of the week
carbon.Parse("2020-08-05 13:14:15").StartOfWeek().ToDateTimeString() // 2020-08-02 00:00:00
carbon.Parse("2020-08-05 13:14:15").SetWeekStartsAt(carbon.Sunday).StartOfWeek().ToDateTimeString() // 2020-08-02 00:00:00
carbon.Parse("2020-08-05 13:14:15").SetWeekStartsAt(carbon.Monday).StartOfWeek().ToDateTimeString() // 2020-08-03 00:00:00
// End of the week
carbon.Parse("2020-08-05 13:14:15").EndOfWeek().ToDateTimeString() // 2020-08-08 23:59:59
carbon.Parse("2020-08-05 13:14:15").SetWeekStartsAt(carbon.Sunday).EndOfWeek().ToDateTimeString() // 2020-08-08 23:59:59
carbon.Parse("2020-08-05 13:14:15").SetWeekStartsAt(carbon.Monday).EndOfWeek().ToDateTimeString() // 2020-08-09 23:59:59

// Start of the day
carbon.Parse("2020-08-05 13:14:15").StartOfDay().ToDateTimeString() // 2020-08-05 00:00:00
// End of the day
carbon.Parse("2020-08-05 13:14:15").EndOfDay().ToDateTimeString() // 2020-08-05 23:59:59

// Start of the hour
carbon.Parse("2020-08-05 13:14:15").StartOfHour().ToDateTimeString() // 2020-08-05 13:00:00
// End of the hour
carbon.Parse("2020-08-05 13:14:15").EndOfHour().ToDateTimeString() // 2020-08-05 13:59:59

// Start of the minute
carbon.Parse("2020-08-05 13:14:15").StartOfMinute().ToDateTimeString() // 2020-08-05 13:14:00
// End of the minute
carbon.Parse("2020-08-05 13:14:15").EndOfMinute().ToDateTimeString() // 2020-08-05 13:14:59

// Start of the second
carbon.Parse("2020-08-05 13:14:15").StartOfSecond().ToString() // 2020-08-05 13:14:15 +0800 CST
// End of the second
carbon.Parse("2020-08-05 13:14:15").EndOfSecond().ToString() // 2020-08-05 13:14:15.999999999 +0800 CST
```

##### Addition and subtraction

```go
// Add three centuries
carbon.Parse("2020-02-29 13:14:15").AddCenturies(3).ToDateTimeString() // 2320-02-29 13:14:15
// Add three centuries without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddCenturiesNoOverflow(3).ToDateTimeString() // 2320-02-29 13:14:15
// Add one century
carbon.Parse("2020-02-29 13:14:15").AddCentury().ToDateTimeString() // 2120-02-29 13:14:15
// Add one century without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddCenturyNoOverflow().ToDateTimeString() // 2120-02-29 13:14:15
// Subtract three centuries
carbon.Parse("2020-02-29 13:14:15").SubCenturies(3).ToDateTimeString() // 1720-02-29 13:14:15
// Subtract three centuries without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubCenturiesNoOverflow(3).ToDateTimeString() // 1720-02-29 13:14:15
// Subtract one century
carbon.Parse("2020-02-29 13:14:15").SubCentury().ToDateTimeString() // 1920-02-29 13:14:15
// Subtract one century without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubCenturyNoOverflow().ToDateTimeString() // 1920-02-20 13:14:15

// Add three decades
carbon.Parse("2020-02-29 13:14:15").AddDecades(3).ToDateTimeString() // 2050-03-01 13:14:15
// Add three decades without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddDecadesNoOverflow(3).ToDateTimeString() // 2050-02-28 13:14:15
// Add one decade
carbon.Parse("2020-02-29 13:14:15").AddDecade().ToDateTimeString() // 2030-03-01 13:14:15
// Add one decade without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddDecadeNoOverflow().ToDateTimeString() // 2030-02-28 13:14:15
// Subtract three decades
carbon.Parse("2020-02-29 13:14:15").SubDecades(3).ToDateTimeString() // 1990-03-01 13:14:15
// Subtract three decades without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubDecadesNoOverflow(3).ToDateTimeString() // 1990-02-28 13:14:15
// Subtract one decade
carbon.Parse("2020-02-29 13:14:15").SubDecade().ToDateTimeString() // 2010-03-01 13:14:15
// Subtract one decade without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubDecadeNoOverflow().ToDateTimeString() // 2010-02-28 13:14:15

// Add three years
carbon.Parse("2020-02-29 13:14:15").AddYears(3).ToDateTimeString() // 2023-03-01 13:14:15
// Add three years without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddYearsNoOverflow(3).ToDateTimeString() // 2023-02-28 13:14:15
// Add one year
carbon.Parse("2020-02-29 13:14:15").AddYear().ToDateTimeString() // 2021-03-01 13:14:15
// Add one year without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddYearNoOverflow().ToDateTimeString() // 2021-02-28 13:14:15
// Subtract three years
carbon.Parse("2020-02-29 13:14:15").SubYears(3).ToDateTimeString() // 2017-03-01 13:14:15
// Subtract three years without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubYearsNoOverflow(3).ToDateTimeString() // 2017-02-28 13:14:15
// Subtract one year
carbon.Parse("2020-02-29 13:14:15").SubYear().ToDateTimeString() // 2019-03-01 13:14:15
// Subtract one year without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubYearNoOverflow().ToDateTimeString() // 2019-02-28 13:14:15

// Add three quarters
carbon.Parse("2019-08-31 13:14:15").AddQuarters(3).ToDateTimeString() // 2019-03-02 13:14:15
// Add three quarters without overflowing month
carbon.Parse("2019-08-31 13:14:15").AddQuartersNoOverflow(3).ToDateTimeString() // 2019-02-29 13:14:15
// Add one quarter
carbon.Parse("2019-11-30 13:14:15").AddQuarter().ToDateTimeString() // 2020-03-01 13:14:15
// Add one quarter without overflowing month
carbon.Parse("2019-11-30 13:14:15").AddQuarterNoOverflow().ToDateTimeString() // 2020-02-29 13:14:15
// Subtract three quarters
carbon.Parse("2019-08-31 13:14:15").SubQuarters(3).ToDateTimeString() // 2019-03-03 13:14:15
// Subtract three quarters without overflowing month
carbon.Parse("2019-08-31 13:14:15").SubQuartersNoOverflow(3).ToDateTimeString() // 2019-02-28 13:14:15
// Subtract one quarter
carbon.Parse("2020-05-31 13:14:15").SubQuarter().ToDateTimeString() // 2020-03-02 13:14:15
// Subtract one quarter without overflowing month
carbon.Parse("2020-05-31 13:14:15").SubQuarterNoOverflow().ToDateTimeString() // 2020-02-29 13:14:15

// Add three months
carbon.Parse("2020-02-29 13:14:15").AddMonths(3).ToDateTimeString() // 2020-05-29 13:14:15
// Add three months without overflowing month
carbon.Parse("2020-02-29 13:14:15").AddMonthsNoOverflow(3).ToDateTimeString() // 2020-05-29 13:14:15
// Add one month
carbon.Parse("2020-01-31 13:14:15").AddMonth().ToDateTimeString() // 2020-03-02 13:14:15
// Add one month without overflowing month
carbon.Parse("2020-01-31 13:14:15").AddMonthNoOverflow().ToDateTimeString() // 2020-02-29 13:14:15
// Subtract three months
carbon.Parse("2020-02-29 13:14:15").SubMonths(3).ToDateTimeString() // 2019-11-29 13:14:15
// Subtract three months without overflowing month
carbon.Parse("2020-02-29 13:14:15").SubMonthsNoOverflow(3).ToDateTimeString() // 2019-11-29 13:14:15
// Subtract one month
carbon.Parse("2020-03-31 13:14:15").SubMonth().ToDateTimeString() // 2020-03-02 13:14:15
// Subtract one month without overflowing month
carbon.Parse("2020-03-31 13:14:15").SubMonthNoOverflow().ToDateTimeString() // 2020-02-29 13:14:15

// Add three weeks
carbon.Parse("2020-02-29 13:14:15").AddWeeks(3).ToDateTimeString() // 2020-03-21 13:14:15
// Add one week
carbon.Parse("2020-02-29 13:14:15").AddWeek().ToDateTimeString() // 2020-03-07 13:14:15
// Subtract three weeks
carbon.Parse("2020-02-29 13:14:15").SubWeeks(3).ToDateTimeString() // 2020-02-08 13:14:15
// Subtract three week
carbon.Parse("2020-02-29 13:14:15").SubWeek().ToDateTimeString() // 2020-02-22 13:14:15

// Add three days
carbon.Parse("2020-08-05 13:14:15").AddDays(3).ToDateTimeString() // 2020-08-08 13:14:15
// Add one day
carbon.Parse("2020-08-05 13:14:15").AddDay().ToDateTimeString() // 2020-08-05 13:14:15
// Subtract three days
carbon.Parse("2020-08-05 13:14:15").SubDays(3).ToDateTimeString() // 2020-08-02 13:14:15
// Subtract one day
carbon.Parse("2020-08-05 13:14:15").SubDay().ToDateTimeString() // 2020-08-04 13:14:15

// Add three hours
carbon.Parse("2020-08-05 13:14:15").AddHours(3).ToDateTimeString() // 2020-08-05 16:14:15
// Add two and a half hours
carbon.Parse("2020-08-05 13:14:15").AddDuration("2.5h").ToDateTimeString() // 2020-08-05 15:44:15
carbon.Parse("2020-08-05 13:14:15").AddDuration("2h30m").ToDateTimeString() // 2020-08-05 15:44:15
// Add one hour
carbon.Parse("2020-08-05 13:14:15").AddHour().ToDateTimeString() // 2020-08-05 14:14:15
// Subtract three hours
carbon.Parse("2020-08-05 13:14:15").SubHours(3).ToDateTimeString() // 2020-08-05 10:14:15
// Subtract two and a half hours
carbon.Parse("2020-08-05 13:14:15").SubDuration("2.5h").ToDateTimeString() // 2020-08-05 10:44:15
carbon.Parse("2020-08-05 13:14:15").SubDuration("2h30m").ToDateTimeString() // 2020-08-05 10:44:15
// Subtract one hour
carbon.Parse("2020-08-05 13:14:15").SubHour().ToDateTimeString() // 2020-08-05 12:14:15

// Add three minutes
carbon.Parse("2020-08-05 13:14:15").AddMinutes(3).ToDateTimeString() // 2020-08-05 13:17:15
// Add two and a half minutes
carbon.Parse("2020-08-05 13:14:15").AddDuration("2.5m").ToDateTimeString() // 2020-08-05 13:16:45
carbon.Parse("2020-08-05 13:14:15").AddDuration("2m30s").ToDateTimeString() // 2020-08-05 13:16:45
// Add one minute
carbon.Parse("2020-08-05 13:14:15").AddMinute().ToDateTimeString() // 2020-08-05 13:15:15
// Subtract three minutes
carbon.Parse("2020-08-05 13:14:15").SubMinutes(3).ToDateTimeString() // 2020-08-05 13:11:15
// Subtract two and a half minutes
carbon.Parse("2020-08-05 13:14:15").SubDuration("2.5m").ToDateTimeString() // 2020-08-05 13:11:45
// Subtract one minute
carbon.Parse("2020-08-05 13:14:15").SubMinute().ToDateTimeString() // 2020-08-05 13:13:15

// Add three seconds
carbon.Parse("2020-08-05 13:14:15").AddSeconds(3).ToDateTimeString() // 2020-08-05 13:14:18
// Add two and a half seconds
carbon.Parse("2020-08-05 13:14:15").AddDuration("2.5s").ToDateTimeString() // 2020-08-05 13:14:17
// Add one second
carbon.Parse("2020-08-05 13:14:15").AddSecond().ToDateTimeString() // 2020-08-05 13:14:16
// Subtract three seconds
carbon.Parse("2020-08-05 13:14:15").SubSeconds(3).ToDateTimeString() // 2020-08-05 13:14:12
// Subtract two and a half seconds
carbon.Parse("2020-08-05 13:14:15").SubDuration("2.5s").ToDateTimeString() // 2020-08-05 13:14:12
// Subtract one second
carbon.Parse("2020-08-05 13:14:15").SubSecond().ToDateTimeString() // 2020-08-05 13:14:14

// Add three milliseconds
carbon.Parse("2020-08-05 13:14:15.222222222").AddMilliseconds(3).ToString() // 2020-08-05 13:14:15.225222222 +0800 CST
// Add one millisecond
carbon.Parse("2020-08-05 13:14:15.222222222").AddMillisecond().ToString() // 2020-08-05 13:14:15.223222222 +0800 CST
// Subtract three milliseconds
carbon.Parse("2020-08-05 13:14:15.222222222").SubMilliseconds(3).ToString() // 2020-08-05 13:14:15.219222222 +0800 CST
// Subtract one millisecond
carbon.Parse("2020-08-05 13:14:15.222222222").SubMillisecond().ToString() // 2020-08-05 13:14:15.221222222 +0800 CST

// Add three microseconds
carbon.Parse("2020-08-05 13:14:15.222222222").AddMicroseconds(3).ToString() // 2020-08-05 13:14:15.222225222 +0800 CST
// Add one microsecond
carbon.Parse("2020-08-05 13:14:15.222222222").AddMicrosecond().ToString() // 2020-08-05 13:14:15.222223222 +0800 CST
// Subtract three microseconds
carbon.Parse("2020-08-05 13:14:15.222222222").SubMicroseconds(3).ToString() // 2020-08-05 13:14:15.222219222 +0800 CST
// Subtract one microsecond
carbon.Parse("2020-08-05 13:14:15.222222222").SubMicrosecond().ToString() // 2020-08-05 13:14:15.222221222 +0800 CST

// Add three nanoseconds
carbon.Parse("2020-08-05 13:14:15.222222222").AddNanoseconds(3).ToString() // 2020-08-05 13:14:15.222222225 +0800 CST
// Add one nanosecond
carbon.Parse("2020-08-05 13:14:15.222222222").AddNanossecond().ToString() // 2020-08-05 13:14:15.222222223 +0800 CST
// Subtract three nanoseconds
carbon.Parse("2020-08-05 13:14:15.222222222").SubNanosseconds(3).ToString() // 2020-08-05 13:14:15.222222219 +0800 CST
// Subtract one nanosecond
carbon.Parse("2020-08-05 13:14:15.222222222").SubNanossecond().ToString() // 2020-08-05 13:14:15.222222221 +0800 CST
```

##### Difference

```go
// Difference in years
carbon.Parse("2021-08-05 13:14:15").DiffInYears(carbon.Parse("2020-08-05 13:14:15")) // -1
// Difference in years with absolute value
carbon.Parse("2021-08-05 13:14:15").DiffAbsInYears(carbon.Parse("2020-08-05 13:14:15")) // 1

// Difference in months
carbon.Parse("2020-08-05 13:14:15").DiffInMonths(carbon.Parse("2020-07-05 13:14:15")) // -1
// Difference in months with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInMonths(carbon.Parse("2020-07-05 13:14:15")) // 1

// Difference in weeks
carbon.Parse("2020-08-05 13:14:15").DiffInWeeks(carbon.Parse("2020-07-28 13:14:15")) // -1
// Difference in weeks with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInWeeks(carbon.Parse("2020-07-28 13:14:15")) // 1

// Difference in days
carbon.Parse("2020-08-05 13:14:15").DiffInDays(carbon.Parse("2020-08-04 13:14:15")) // -1
// Difference in days with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInDays(carbon.Parse("2020-08-04 13:14:15")) // 1

// Difference in hours
carbon.Parse("2020-08-05 13:14:15").DiffInHours(carbon.Parse("2020-08-05 12:14:15")) // -1
// Difference in hours with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInHours(carbon.Parse("2020-08-05 12:14:15")) // 1

// Difference in minutes
carbon.Parse("2020-08-05 13:14:15").DiffInMinutes(carbon.Parse("2020-08-05 13:13:15")) // -1
// Difference in minutes with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInMinutes(carbon.Parse("2020-08-05 13:13:15")) // 1

// Difference in seconds
carbon.Parse("2020-08-05 13:14:15").DiffInSeconds(carbon.Parse("2020-08-05 13:14:14")) // -1
// Difference in seconds with absolute value
carbon.Parse("2020-08-05 13:14:15").DiffAbsInSeconds(carbon.Parse("2020-08-05 13:14:14")) // 1

// Difference in string
carbon.Now().DiffInString() // just now
carbon.Now().AddYearsNoOverflow(1).DiffInString() // -1 year
carbon.Now().SubYearsNoOverflow(1).DiffInString() // 1 year
// Difference in string with absolute value
carbon.Now().DiffAbsInString(carbon.Now()) // just now
carbon.Now().AddYearsNoOverflow(1).DiffAbsInString(carbon.Now()) // 1 year
carbon.Now().SubYearsNoOverflow(1).DiffAbsInString(carbon.Now()) // 1 year

// Difference in a human-readable format
carbon.Parse("2020-08-05 13:14:15").DiffForHumans() // just now
carbon.Parse("2019-08-05 13:14:15").DiffForHumans() // 1 year ago
carbon.Parse("2018-08-05 13:14:15").DiffForHumans() // 2 years ago
carbon.Parse("2021-08-05 13:14:15").DiffForHumans() // 1 year from now
carbon.Parse("2022-08-05 13:14:15").DiffForHumans() // 2 years from now
// Difference in a human-readable format from now time
carbon.Parse("2020-08-05 13:14:15").DiffForHumans(carbon.Now()) // 1 year before
carbon.Parse("2019-08-05 13:14:15").DiffForHumans(carbon.Now()) // 2 years before
carbon.Parse("2018-08-05 13:14:15").DiffForHumans(carbon.Now()) // 1 year after
carbon.Parse("2022-08-05 13:14:15").DiffForHumans(carbon.Now()) // 2 years after
```

##### Comparison

```go
// Whether is zero time
carbon.Parse("").IsZero() // true
carbon.Parse("0").IsZero() // true
carbon.Parse("0000-00-00 00:00:00").IsZero() // true
carbon.Parse("0000-00-00").IsZero() // true
carbon.Parse("00:00:00").IsZero() // true
carbon.Parse("2020-08-05 00:00:00").IsZero() // false
carbon.Parse("2020-08-05").IsZero() // false
carbon.Parse("2020-08-05").SetTimezone("xxx").IsZero() // false

// Whether is valid time
carbon.Parse("").IsValid() // false
carbon.Parse("0").IsValid() // false
carbon.Parse("0000-00-00 00:00:00").IsValid() // false
carbon.Parse("0000-00-00").IsValid() // false
carbon.Parse("00:00:00").IsValid() // false
carbon.Parse("2020-08-05 00:00:00").IsValid() // true
carbon.Parse("2020-08-05").IsValid() // true
carbon.Parse("2020-08-05").SetTimezone("xxx").IsValid() // false

// Whether is invalid time
carbon.Parse("").IsInvalid() // true
carbon.Parse("0").IsInvalid() // true
carbon.Parse("0000-00-00 00:00:00").IsInvalid() // true
carbon.Parse("0000-00-00").IsInvalid() // true
carbon.Parse("00:00:00").IsInvalid() // true
carbon.Parse("2020-08-05 00:00:00").IsInvalid() // false
carbon.Parse("2020-08-05").IsInvalid() // false
carbon.Parse("2020-08-05").SetTimezone("xxx").IsInvalid() // true

// Whether is now time
carbon.Now().IsNow() // true
// Whether is future time
carbon.Tomorrow().IsFuture() // true
// Whether is pass time
carbon.Yesterday().IsPast() // true

// Whether is a leap year
carbon.Parse("2020-08-05 13:14:15").IsLeapYear() // true
// Whether is a long year
carbon.Parse("2020-08-05 13:14:15").IsLongYear() // true

// Whether is January
carbon.Parse("2020-08-05 13:14:15").IsJanuary() // false
// Whether is February
carbon.Parse("2020-08-05 13:14:15").IsFebruary() // false
// Whether is March
carbon.Parse("2020-08-05 13:14:15").IsMarch() // false
// Whether is April
carbon.Parse("2020-08-05 13:14:15").IsApril()  // false
// Whether is May
carbon.Parse("2020-08-05 13:14:15").IsMay() // false
// Whether is June
carbon.Parse("2020-08-05 13:14:15").IsJune() // false
// Whether is July
carbon.Parse("2020-08-05 13:14:15").IsJuly() // false
// Whether is August
carbon.Parse("2020-08-05 13:14:15").IsAugust() // false
// Whether is September
carbon.Parse("2020-08-05 13:14:15").IsSeptember() // true
// Whether is October
carbon.Parse("2020-08-05 13:14:15").IsOctober() // false
// Whether is November
carbon.Parse("2020-08-05 13:14:15").IsNovember() // false
// Whether is December
carbon.Parse("2020-08-05 13:14:15").IsDecember() // false

// Whether is Monday
carbon.Parse("2020-08-05 13:14:15").IsMonday() // false
// Whether is Tuesday
carbon.Parse("2020-08-05 13:14:15").IsTuesday() // true
// Whether is Wednesday
carbon.Parse("2020-08-05 13:14:15").IsWednesday() // false
// Whether is Thursday
carbon.Parse("2020-08-05 13:14:15").IsThursday() // false
// Whether is Friday
carbon.Parse("2020-08-05 13:14:15").IsFriday() // false
// Whether is Saturday
carbon.Parse("2020-08-05 13:14:15").IsSaturday() // false
// Whether is Sunday
carbon.Parse("2020-08-05 13:14:15").IsSunday() // false
// Whether is weekday
carbon.Parse("2020-08-05 13:14:15").IsWeekday() // false
// Whether is weekend
carbon.Parse("2020-08-05 13:14:15").IsWeekend() // true

// Whether is yesterday
carbon.Parse("2020-08-04 13:14:15").IsYesterday() // true
carbon.Parse("2020-08-04 00:00:00").IsYesterday() // true
carbon.Parse("2020-08-04").IsYesterday() // true
// Whether is today
carbon.Parse("2020-08-05 13:14:15").IsToday() // true
carbon.Parse("2020-08-05 00:00:00").IsToday() // true
carbon.Parse("2020-08-05").IsToday() // true
// Whether is tomorrow
carbon.Parse("2020-08-06 13:14:15").IsTomorrow() // true
carbon.Parse("2020-08-06 00:00:00").IsTomorrow() // true
carbon.Parse("2020-08-06").IsTomorrow() // true

// Whether is same century
carbon.Parse("2020-08-05 13:14:15").IsSameCentury(carbon.Parse("3020-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").IsSameCentury(carbon.Parse("2099-08-05 13:14:15")) // true
// Whether is same decade
carbon.Parse("2020-08-05 13:14:15").IsSameDecade(carbon.Parse("2030-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").IsSameDecade(carbon.Parse("2120-08-05 13:14:15")) // true
// Whether is same year
carbon.Parse("2020-08-05 00:00:00").IsSameYear(carbon.Parse("2021-08-05 13:14:15")) // false
carbon.Parse("2020-01-01 00:00:00").IsSameYear(carbon.Parse("2020-12-31 13:14:15")) // true
// Whether is same quarter
carbon.Parse("2020-08-05 00:00:00").IsSameQuarter(carbon.Parse("2020-09-05 13:14:15")) // false
carbon.Parse("2020-01-01 00:00:00").IsSameQuarter(carbon.Parse("2021-01-31 13:14:15")) // true
// Whether is same month
carbon.Parse("2020-01-01 00:00:00").IsSameMonth(carbon.Parse("2021-01-31 13:14:15")) // false
carbon.Parse("2020-01-01 00:00:00").IsSameMonth(carbon.Parse("2020-01-31 13:14:15")) // true
// Whether is same day
carbon.Parse("2020-08-05 13:14:15").IsSameDay(carbon.Parse("2021-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 00:00:00").IsSameDay(carbon.Parse("2020-08-05 13:14:15")) // true
// Whether is same hour
carbon.Parse("2020-08-05 13:14:15").IsSameHour(carbon.Parse("2021-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:00:00").IsSameHour(carbon.Parse("2020-08-05 13:14:15")) // true
// Whether is same minute
carbon.Parse("2020-08-05 13:14:15").IsSameMinute(carbon.Parse("2021-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:00").IsSameMinute(carbon.Parse("2020-08-05 13:14:15")) // true
// Whether is same second
carbon.Parse("2020-08-05 13:14:15").IsSameSecond(carbon.Parse("2021-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").IsSameSecond(carbon.Parse("2020-08-05 13:14:15")) // true

// Whether greater than
carbon.Parse("2020-08-05 13:14:15").Gt(carbon.Parse("2020-08-04 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Gt(carbon.Parse("2020-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").Compare(">", carbon.Parse("2020-08-04 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare(">", carbon.Parse("2020-08-05 13:14:15")) // false

// Whether less than
carbon.Parse("2020-08-05 13:14:15").Lt(carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Lt(carbon.Parse("2020-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").Compare("<", carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare("<", carbon.Parse("2020-08-05 13:14:15")) // false

// Whether equal
carbon.Parse("2020-08-05 13:14:15").Eq(carbon.Parse("2020-08-05 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Eq(carbon.Parse("2020-08-05 13:14:00")) // false
carbon.Parse("2020-08-05 13:14:15").Compare("=", carbon.Parse("2020-08-05 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare("=", carbon.Parse("2020-08-05 13:14:00")) // false

// Whether not equal
carbon.Parse("2020-08-05 13:14:15").Ne(carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Ne(carbon.Parse("2020-08-05 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").Compare("!=", carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare("<>", carbon.Parse("2020-08-05 13:14:15")) // false

// Whether greater than or equal
carbon.Parse("2020-08-05 13:14:15").Gte(carbon.Parse("2020-08-04 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Gte(carbon.Parse("2020-08-05 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare(">=", carbon.Parse("2020-08-04 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare(">=", carbon.Parse("2020-08-05 13:14:15")) // true

// Whether less than or equal
carbon.Parse("2020-08-05 13:14:15").Lte(carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Lte(carbon.Parse("2020-08-05 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare("<=", carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").Compare("<=", carbon.Parse("2020-08-05 13:14:15")) // true

// Whether between two Carbon instances, excluded the start and end Carbon instance
carbon.Parse("2020-08-05 13:14:15").Between(carbon.Parse("2020-08-05 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // false
carbon.Parse("2020-08-05 13:14:15").Between(carbon.Parse("2020-08-04 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // true

// Whether between two Carbon instances, included the start Carbon instance
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedStart(carbon.Parse("2020-08-05 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedStart(carbon.Parse("2020-08-04 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // true

// Whether between two Carbon instances, included the end Carbon instance
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedEnd(carbon.Parse("2020-08-04 13:14:15"), carbon.Parse("2020-08-05 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedEnd(carbon.Parse("2020-08-04 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // true

// Whether between two Carbon instances, included the start and end Carbon instance
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedBoth(carbon.Parse("2020-08-05 13:14:15"), carbon.Parse("2020-08-06 13:14:15")) // true
carbon.Parse("2020-08-05 13:14:15").BetweenIncludedBoth(carbon.Parse("2020-08-04 13:14:15"), carbon.Parse("2020-08-05 13:14:15")) // true
```

> For the definition of long year, please see https://en.wikipedia.org/wiki/ISO_8601#Week_dates

##### Setter

```go
// Set timezone
carbon.SetTimezone(carbon.PRC).Now().ToDateTimeString() // 2020-08-05 13:14:15
carbon.SetTimezone(carbon.Tokyo).Now().ToDateTimeString() // 2020-08-05 14:14:15
carbon.SetTimezone(carbon.Tokyo).Now().SetTimezone(carbon.PRC).ToDateTimeString() // 2020-08-05 12:14:15

// Set location
utc, _ := time.LoadLocation(carbon.UTC)
carbon.SetLocation(utc).Now().ToDateTimeString() // 2022-06-28 09:25:38
tokyo, _ := time.LoadLocation(carbon.Tokyo)
carbon.SetLocation(tokyo).Now().ToDateTimeString() // 2022-06-28 18:25:38

// Set locale
carbon.Parse("2020-07-05 13:14:15").SetLocale("en").DiffForHumans() // 1 month before
carbon.Parse("2020-07-05 13:14:15").SetLocale("zh-CN").DiffForHumans() // 1 月前

// Set year, month, day, hour, minute and second
carbon.Parse("2020-01-01").SetDateTime(2019, 2, 2, 13, 14, 15).ToString() // 2019-02-02 13:14:15 +0800 CST
carbon.Parse("2020-01-01").SetDateTime(2019, 2, 31, 13, 14, 15).ToString() // 2019-03-03 13:14:15 +0800 CST
// Set year, month, day, hour, minute, second and millisecond
carbon.Parse("2020-01-01").SetDateTimeMilli(2019, 2, 2, 13, 14, 15, 999).ToString() // 2019-02-02 13:14:15.999 +0800 CST
carbon.Parse("2020-01-01").SetDateTimeMilli(2019, 2, 31, 13, 14, 15, 999).ToString() // 2019-03-03 13:14:15.999 +0800 CST
// Set year, month, day, hour, minute, second and microsecond
carbon.Parse("2020-01-01").SetDateTimeMicro(2019, 2, 2, 13, 14, 15, 999999).ToString() // 2019-02-02 13:14:15.999999 +0800 CST
carbon.Parse("2020-01-01").SetDateTimeMicro(2019, 2, 31, 13, 14, 15, 999999).ToString() // 2019-03-03 13:14:15.999999 +0800 CST
// Set year, month, day, hour, minute, second and nanosecond
carbon.Parse("2020-01-01").SetDateTimeNano(2019, 2, 2, 13, 14, 15, 999999999).ToString() // 2019-02-02 13:14:15.999999999 +0800 CST
carbon.Parse("2020-01-01").SetDateTimeNano(2019, 2, 31, 13, 14, 15, 999999999).ToString() // 2019-03-03 13:14:15.999999999 +0800 CST

// Set year, month and day
carbon.Parse("2020-01-01").SetDate(2019, 2, 2).ToString() // 2019-02-02 00:00:00 +0800 CST
carbon.Parse("2020-01-01").SetDate(2019, 2, 31).ToString() // 2019-03-03 00:00:00 +0800 CST
// Set year, month, day and millisecond
carbon.Parse("2020-01-01").SetDateMilli(2019, 2, 2, 999).ToString() // 2019-02-02 00:00:00.999 +0800 CST
carbon.Parse("2020-01-01").SetDateMilli(2019, 2, 31, 999).ToString() // 2019-03-03 00:00:00.999 +0800 CST
// Set year, month, day and microsecond
carbon.Parse("2020-01-01").SetDateMicro(2019, 2, 2, 999999).ToString() // 2019-02-02 00:00:00.999999 +0800 CST
carbon.Parse("2020-01-01").SetDateMicro(2019, 2, 31, 999999).ToString() // 2019-03-03 00:00:00.999999 +0800 CST
// Set year, month, day and nanosecond
carbon.Parse("2020-01-01").SetDateNano(2019, 2, 2, 999999999).ToString() // 2019-02-02 00:00:00.999999999 +0800 CST
carbon.Parse("2020-01-01").SetDateNano(2019, 2, 31, 999999999).ToString() // 2019-03-03 00:00:00.999999999 +0800 CST

// Set hour, minute and second
carbon.Parse("2020-01-01").SetTime(13, 14, 15).ToString() // 2020-01-01 13:14:15 +0800 CST
carbon.Parse("2020-01-01").SetTime(13, 14, 90).ToString() // 2020-01-01 13:15:30 +0800 CST
// Set hour, minute, second and millisecond
carbon.Parse("2020-01-01").SetTimeMilli(13, 14, 15, 999).ToString() // 2020-01-01 13:14:15.999 +0800 CST
carbon.Parse("2020-01-01").SetTimeMilli(13, 14, 90, 999).ToString() // 2020-01-01 13:15:30.999 +0800 CST
// Set hour, minute, second and microsecond
carbon.Parse("2020-01-01").SetTimeMicro(13, 14, 15, 999999).ToString() // 2020-01-01 13:14:15.999999 +0800 CST
carbon.Parse("2020-01-01").SetTimeMicro(13, 14, 90, 999999).ToString() // 2020-01-01 13:15:30.999999 +0800 CST
// Set hour, minute, second and nanosecond
carbon.Parse("2020-01-01").SetTimeNano(13, 14, 15, 999999999).ToString() // 2020-01-01 13:14:15.999999999 +0800 CST
carbon.Parse("2020-01-01").SetTimeNano(13, 14, 90, 999999999).ToString() // 2020-01-01 13:15:30.999999999 +0800 CST

// Set year
carbon.Parse("2020-02-29").SetYear(2021).ToDateString() // 2021-03-01
// Set year without overflowing month
carbon.Parse("2020-02-29").SetYearNoOverflow(2021).ToDateString() // 2021-02-28

// Set month
carbon.Parse("2020-01-31").SetMonth(2).ToDateString() // 2020-03-02
// Set month without overflowing month
carbon.Parse("2020-01-31").SetMonthNoOverflow(2).ToDateString() // 2020-02-29

// Set start day of the week
carbon.Parse("2020-08-02").SetWeekStartsAt(carbon.Sunday).Week() // 0
carbon.Parse("2020-08-02").SetWeekStartsAt(carbon.Monday).Week() // 6

// Set day
carbon.Parse("2019-08-05").SetDay(31).ToDateString() // 2020-08-31
carbon.Parse("2020-02-01").SetDay(31).ToDateString() // 2020-03-02

// Set hour
carbon.Parse("2020-08-05 13:14:15").SetHour(10).ToDateTimeString() // 2020-08-05 10:14:15
carbon.Parse("2020-08-05 13:14:15").SetHour(24).ToDateTimeString() // 2020-08-06 00:14:15

// Set minute
carbon.Parse("2020-08-05 13:14:15").SetMinute(10).ToDateTimeString() // 2020-08-05 13:10:15
carbon.Parse("2020-08-05 13:14:15").SetMinute(60).ToDateTimeString() // 2020-08-05 14:00:15

// Set second
carbon.Parse("2020-08-05 13:14:15").SetSecond(10).ToDateTimeString() // 2020-08-05 13:14:10
carbon.Parse("2020-08-05 13:14:15").SetSecond(60).ToDateTimeString() // 2020-08-05 13:15:00

// Set millisecond
carbon.Parse("2020-08-05 13:14:15").SetMillisecond(100).Millisecond() // 100
carbon.Parse("2020-08-05 13:14:15").SetMillisecond(999).Millisecond() // 999

// Set microsecond
carbon.Parse("2020-08-05 13:14:15").SetMicrosecond(100000).Microsecond() // 100000
carbon.Parse("2020-08-05 13:14:15").SetMicrosecond(999999).Microsecond() // 999999

// Set nanosecond
carbon.Parse("2020-08-05 13:14:15").SetNanosecond(100000000).Nanosecond() // 100000000
carbon.Parse("2020-08-05 13:14:15").SetNanosecond(999999999).Nanosecond() // 999999999
```

##### Getter

```go
// Get total days of the year
carbon.Parse("2019-08-05 13:14:15").DaysInYear() // 365
carbon.Parse("2020-08-05 13:14:15").DaysInYear() // 366
// Get total days of the month
carbon.Parse("2020-02-01 13:14:15").DaysInMonth() // 29
carbon.Parse("2020-04-01 13:14:15").DaysInMonth() // 30
carbon.Parse("2020-08-01 13:14:15").DaysInMonth() // 31

// Get day of the year
carbon.Parse("2020-08-05 13:14:15").DayOfYear() // 218
// Get week of the year
carbon.Parse("2020-08-05 13:14:15").WeekOfYear() // 32
// Get day of the month
carbon.Parse("2020-08-05 13:14:15").DayOfMonth() // 5
// Get week of the month
carbon.Parse("2020-08-05 13:14:15").WeekOfMonth() // 1
// Get day of the week
carbon.Parse("2020-08-05 13:14:15").DayOfWeek() // 3

// Get current year, month, day, hour, minute and second
carbon.Parse("2020-08-05 13:14:15").DateTime() // 2020, 8, 5, 13, 14, 15
// Get current year, month, day, hour, minute, second and millisecond
carbon.Parse("2020-08-05 13:14:15").DateTimeMilli() // 2020, 8, 5, 13, 14, 15, 999
// Get current year, month, day, hour, minute, second and microsecond
carbon.Parse("2020-08-05 13:14:15").DateTimeMicro() // 2020, 8, 5, 13, 14, 15, 999999
// Get current year, month, day, hour, minute, second and nanosecond
carbon.Parse("2020-08-05 13:14:15").DateTimeNano() // 2020, 8, 5, 13, 14, 15, 999999999

// Get current year, month and day
carbon.Parse("2020-08-05 13:14:15.999999999").Date() // 2020, 8, 5
// Get current year, month, day and millisecond
carbon.Parse("2020-08-05 13:14:15.999999999").DateMilli() // 2020, 8, 5, 999
// Get current year, month, day and microsecond
carbon.Parse("2020-08-05 13:14:15.999999999").DateMicro() // 2020, 8, 5, 999999
// Get current year, month, day and nanosecond
carbon.Parse("2020-08-05 13:14:15.999999999").DateNano() // 2020, 8, 5, 999999999

// Get current hour, minute and second
carbon.Parse("2020-08-05 13:14:15.999999999").Time() // 13, 14, 15
// Get current hour, minute, second and millisecond
carbon.Parse("2020-08-05 13:14:15.999999999").TimeMilli() // 13, 14, 15, 999
// Get current hour, minute, second and microsecond
carbon.Parse("2020-08-05 13:14:15.999999999").TimeMicro() // 13, 14, 15, 999999
// Get current hour, minute, second and nanosecond
carbon.Parse("2020-08-05 13:14:15.999999999").TimeNano() // 13, 14, 15, 999999999

// Get current century
carbon.Parse("2020-08-05 13:14:15").Century() // 21
// Get current decade
carbon.Parse("2019-08-05 13:14:15").Decade() // 10
carbon.Parse("2021-08-05 13:14:15").Decade() // 20
// Get current year
carbon.Parse("2020-08-05 13:14:15").Year() // 2020
// Get current quarter
carbon.Parse("2020-08-05 13:14:15").Quarter() // 3
// Get current month
carbon.Parse("2020-08-05 13:14:15").Month() // 8
// Get current week(start from 0)
carbon.Parse("2020-08-02 13:14:15").Week() // 0
carbon.Parse("2020-08-02").SetWeekStartsAt(carbon.Sunday).Week() // 0
carbon.Parse("2020-08-02").SetWeekStartsAt(carbon.Monday).Week() // 6
// Get current day
carbon.Parse("2020-08-05 13:14:15").Day() // 5
// Get current hour
carbon.Parse("2020-08-05 13:14:15").Hour() // 13
// Get current minute
carbon.Parse("2020-08-05 13:14:15").Minute() // 14
// Get current second
carbon.Parse("2020-08-05 13:14:15").Second() // 15
// Get current millisecond
carbon.Parse("2020-08-05 13:14:15.999").Millisecond() // 999
// Get current microsecond
carbon.Parse("2020-08-05 13:14:15.999").Microsecond() // 999000
// Get current nanosecond
carbon.Parse("2020-08-05 13:14:15.999").Nanosecond() // 999000000

// Get timestamp with second
carbon.Parse("2020-08-05 13:14:15").Timestamp() // 1596604455
// Get timestamp with millisecond
carbon.Parse("2020-08-05 13:14:15").TimestampMilli() // 1596604455000
// Get timestamp with microsecond
carbon.Parse("2020-08-05 13:14:15").TimestampMicro() // 1596604455000000
// Get timestamp with nanosecond
carbon.Parse("2020-08-05 13:14:15").TimestampNano() // 1596604455000000000

// Get timezone name
carbon.SetTimezone(carbon.PRC).Timezone() // CST
carbon.SetTimezone(carbon.Tokyo).Timezone() // JST

// Get location name
carbon.SetTimezone(carbon.PRC).Location() // PRC
carbon.SetTimezone(carbon.Tokyo).Location() // Asia/Tokyo

// Get offset seconds from the UTC timezone
carbon.SetTimezone(carbon.PRC).Offset() // 28800
carbon.SetTimezone(carbon.Tokyo).Offset() // 32400

// Get locale name
carbon.Now().SetLocale("en").Locale() // en
carbon.Now().SetLocale("zh-CN").Locale() // zh-CN

// Get constellation name
carbon.Now().Constellation() // Leo
carbon.Now().SetLocale("en").Constellation() // Leo
carbon.Now().SetLocale("zh-CN").Constellation() // 狮子座

// Get season name
carbon.Now().Season() // Summer
carbon.Now().SetLocale("en").Season() // Summer
carbon.Now().SetLocale("zh-CN").Season() // 夏季

// Get current age
carbon.Parse("2002-01-01 13:14:15").Age() // 17
carbon.Parse("2002-12-31 13:14:15").Age() // 18
```

##### Output

```go
// Output datetime format string
carbon.Parse("2020-08-05 13:14:15").ToDateTimeString() // 2020-08-05 13:14:15
// Output datetime with millisecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToDateTimeMilliString() // 2020-08-05 13:14:15.999
// Output datetime with microsecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToDateTimeMicroString() // 2020-08-05 13:14:15.999999
// Output datetime with nanosecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToDateTimeNanoString() // 2020-08-05 13:14:15.999999999

// Output short datetime format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToShortDateTimeString() // 20200805131415
// Output short datetime with millisecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToShortDateTimeMilliString() // 20200805131415.999
// Output short datetime with microsecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToShortDateTimeMicroString() // 20200805131415.999999
// Output short datetime with nanosecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToShortDateTimeNanoString() // 20200805131415.999999999

// Output date format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToDateString() // 2020-08-05
// Output date with millisecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToDateMilliString() // 2020-08-05.999
// Output date with microsecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToDateMicroString() // 2020-08-05.999999
// Output date with nanosecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToDateNanoString() // 2020-08-05.999999999

// Output short date format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortDateString() // 20200805
// Output short date with millisecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortDateMilliString() // 20200805.999
// Output short date with microsecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortDateMicroString() // 20200805.999999
// Output short date with nanosecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortDateNanoString() // 20200805.999999999

// Output time format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToTimeString() // 13:14:15
// Output time with millisecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToTimeMilliString() // 13:14:15.999
// Output time with microsecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToTimeMicroString() // 13:14:15.999999
// Output time with nanosecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToTimeNanoString() // 13:14:15.999999999

// Output short time format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortTimeString() // 131415
// Output short time with millisecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortTimeMilliString() // 131415.999
// Output short time with microsecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortTimeMicroString() // 131415.999999
// Output short time with nanosecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToShortTimeNanoString() // 131415.999999999

// Output ANSIC format string
carbon.Parse("2020-08-05 13:14:15").ToANSICString() // Wed Aug  5 13:14:15 2020
// Output Atom format string
carbon.Parse("2020-08-05 13:14:15").ToAtomString() // 2020-08-05T13:14:15+08:00
// Output Unix date format string
carbon.Parse("2020-08-05 13:14:15").ToUnixDateString() // Wed Aug  5 13:14:15 CST 2020
// Output Ruby date format string
carbon.Parse("2020-08-05 13:14:15").ToRubyDateString() // Wed Aug 05 13:14:15 +0800 2020
// Output Kitchen format string
carbon.Parse("2020-08-05 13:14:15").ToKitchenString() // 1:14PM
// Output Cookie format string
carbon.Parse("2020-08-05 13:14:15").ToCookieString() // Wednesday, 05-Aug-2020 13:14:15 CST
// Output day, date and time format string
carbon.Parse("2020-08-05 13:14:15").ToDayDateTimeString() // Wed, Aug 5, 2020 1:14 PM
// Output RSS format string
carbon.Parse("2020-08-05 13:14:15").ToRssString() // Wed, 05 Aug 2020 13:14:15 +0800
// Output W3C format string
carbon.Parse("2020-08-05 13:14:15").ToW3cString() // 2020-08-05T13:14:15+08:00

// Output ISO8601 format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToIso8601String() // 2020-08-05T13:14:15+08:00
// Output ISO8601 with millisecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToIso8601MilliString() // 2020-08-05T13:14:15.999+08:00
// Output ISO8601 with microsecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToIso8601MicroString() // 2020-08-05T13:14:15.999999+08:00
// Output ISO8601 with nanosecond format string
carbon.Parse("2020-08-05 13:14:15.999999999").ToIso8601NanoString() // 2020-08-05T13:14:15.999999999+08:00

// Output RFC822 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc822String() // 05 Aug 20 13:14 CST
// Output RFC822Z format string
carbon.Parse("2020-08-05 13:14:15").ToRfc822zString() // 05 Aug 20 13:14 +0800
// Output RFC850 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc850String() // Wednesday, 05-Aug-20 13:14:15 CST
// Output RFC1036 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc1036String() // Wed, 05 Aug 20 13:14:15 +0800
// Output RFC1123 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc1123String() // Wed, 05 Aug 2020 13:14:15 CST
// Output RFC1123Z format string
carbon.Parse("2020-08-05 13:14:15").ToRfc1123zString() // Wed, 05 Aug 2020 13:14:15 +0800
// Output RFC2822 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc2822String() // Wed, 05 Aug 2020 13:14:15 +0800
// Output RFC7231 format string
carbon.Parse("2020-08-05 13:14:15").ToRfc7231String() // Wed, 05 Aug 2020 13:14:15 GMT

// Output RFC3339 format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToRfc3339String() // 2020-08-05T13:14:15+08:00
// Output RFC3339 with millisecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToRfc3339MilliString() // 2020-08-05T13:14:15.999+08:00
// Output RFC3339  with microsecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToRfc3339MicroString() // 2020-08-05T13:14:15.999999+08:00
// Output RFC3339 with nanosecond format string
carbon.Parse("2020-08-05T13:14:15.999999999+08:00").ToRfc3339NanoString() // 2020-08-05T13:14:15.999999999+08:00

// Output datetime format string
fmt.Sprintf("%s", carbon.Parse("2020-08-05 13:14:15")) // 2020-08-05 13:14:15

// Output "2006-01-02 15:04:05.999999999 -0700 MST" format string
carbon.Parse("2020-08-05 13:14:15").ToString() // 2020-08-05 13:14:15.999999 +0800 CST

// Output string by layout, Layout() is shorthand for ToLayoutString()
carbon.Parse("2020-08-05 13:14:15").Layout(carbon.ISO8601Layout) // 2020-08-05T13:14:15+08:00
carbon.Parse("2020-08-05 13:14:15").Layout("20060102150405") // 20200805131415
carbon.Parse("2020-08-05 13:14:15").Layout("2006年01月02日 15时04分05秒") // 2020年08月05日 13时14分15秒
carbon.Parse("2020-08-05 13:14:15").Layout("It is 2006-01-02 15:04:05") // It is 2020-08-05 13:14:15

// Output string by format, Format() is shorthand for ToFormatString()
carbon.Parse("2020-08-05 13:14:15").Format("YmdHis") // 20200805131415
carbon.Parse("2020-08-05 13:14:15").Format("Y年m月d日 H时i分s秒") // 2020年08月05日 13时14分15秒
carbon.Parse("2020-08-05 13:14:15").Format("l jS \\o\\f F Y h:i:s A") // Wednesday 5th of August 2020 01:14:15 PM
carbon.Parse("2020-08-05 13:14:15").Format("\\I\\t \\i\\s Y-m-d H:i:s") // It is 2020-08-05 13:14:15
```

> For more supported format signs, please see the <a href="#format-sign-table">Format sign table</a>

##### Constellation

```go
// Get constellation name
carbon.Parse("2020-08-05 13:14:15").Constellation() // Leo

// Whether is Aries
carbon.Parse("2020-08-05 13:14:15").IsAries() // false
// Whether is Taurus
carbon.Parse("2020-08-05 13:14:15").IsTaurus() // false
// Whether is Gemini
carbon.Parse("2020-08-05 13:14:15").IsGemini() // false
// Whether is Cancer
carbon.Parse("2020-08-05 13:14:15").IsCancer() // false
// Whether is Leo
carbon.Parse("2020-08-05 13:14:15").IsLeo() // true
// Whether is Virgo
carbon.Parse("2020-08-05 13:14:15").IsVirgo() // false
// Whether is Libra
carbon.Parse("2020-08-05 13:14:15").IsLibra() // false
// Whether is Scorpio
carbon.Parse("2020-08-05 13:14:15").IsScorpio() // false
// Whether is Sagittarius
carbon.Parse("2020-08-05 13:14:15").IsSagittarius() // false
// Whether is Capricorn
carbon.Parse("2020-08-05 13:14:15").IsCapricorn() // false
// Whether is Aquarius
carbon.Parse("2020-08-05 13:14:15").IsAquarius() // false
// Whether is Pisces
carbon.Parse("2020-08-05 13:14:15").IsPisces() // false
```

##### Season

> According to the meteorological division method, March to May is spring, June to August is summer, September to November is autumn, and December to February is winter

```go
// Get season name
carbon.Parse("2020-08-05 13:14:15").Season() // Summer

// Start of the season
carbon.Parse("2020-08-05 13:14:15").StartOfSeason().ToDateTimeString() // 2020-06-01 00:00:00
// End of the season
carbon.Parse("2020-08-05 13:14:15").EndOfSeason().ToDateTimeString() // 2020-08-31 23:59:59

// Whether is spring
carbon.Parse("2020-08-05 13:14:15").IsSpring() // false
// Whether is summer
carbon.Parse("2020-08-05 13:14:15").IsSummer() // true
// Whether is autumn
carbon.Parse("2020-08-05 13:14:15").IsAutumn() // false
// Whether is winter
carbon.Parse("2020-08-05 13:14:15").IsWinter() // false
```

##### Chinese Lunar

> Currently only `200` years from `1900` to `2100` are supported

```go
// Get Chinese Lunar year of animal
carbon.Parse("2020-08-05 13:14:15").Lunar().Animal() // 鼠

// Get Chinese lunar festival
carbon.Parse("2021-02-12 13:14:15").Lunar().Festival() // 春节

// Get Chinese lunar year, month, day, hour, minute and second
carbon.Parse("2020-08-05 13:14:15").Lunar().DateTime() // 2020, 6, 16, 13, 14, 15
// Get Chinese lunar year, month and day
carbon.Parse("2020-08-05 13:14:15").Lunar().Date() // 2020, 6, 16
// Get Chinese lunar hour, minute and second
carbon.Parse("2020-08-05 13:14:15").Lunar().Time() // 13, 14, 15

// Get Chinese lunar year
carbon.Parse("2020-08-05 13:14:15").Lunar().Year() // 2020
// Get Chinese lunar month
carbon.Parse("2020-08-05 13:14:15").Lunar().Month() // 6
// Get Chinese lunar leap month
carbon.Parse("2020-08-05 13:14:15").Lunar().LeapMonth() // 4
// Get Chinese lunar day
carbon.Parse("2020-08-05 13:14:15").Lunar().Day() // 16
// Get Chinese lunar date as YYYY-MM-DD HH::ii::ss format string
fmt.Sprintf("%s", carbon.Parse("2020-08-05 13:14:15").Lunar()) // 2020-06-16 13:14:15

// Get Chinese lunar year as string
carbon.Parse("2020-08-05 13:14:15").Lunar().ToYearString() // 二零二零
// Get Chinese lunar month as string
carbon.Parse("2020-08-05 13:14:15").Lunar().ToMonthString() // 六月
// Get Chinese lunar day as string
carbon.Parse("2020-08-05 13:14:15").Lunar().ToDayString() // 十六
// Get Chinese lunar date as string
carbon.Parse("2020-08-05 13:14:15").Lunar().ToDateString() // 二零二零年六月十六

// Whether is a leap year
carbon.Parse("2020-08-05 13:14:15").Lunar().IsLeapYear() // true
// Whether is a leap month
carbon.Parse("2020-08-05 13:14:15").Lunar().IsLeapMonth() // false

// Whether is a year of the rat
carbon.Parse("2020-08-05 13:14:15").Lunar().IsRatYear() // true
// Whether is a year of the ox
carbon.Parse("2020-08-05 13:14:15").Lunar().IsOxYear() // false
// Whether is a year of the tiger
carbon.Parse("2020-08-05 13:14:15").Lunar().IsTigerYear() // false
// Whether is a year of the rabbit
carbon.Parse("2020-08-05 13:14:15").Lunar().IsRabbitYear() // false
// Whether is a year of the dragon
carbon.Parse("2020-08-05 13:14:15").Lunar().IsDragonYear() // false
// Whether is a year of the snake
carbon.Parse("2020-08-05 13:14:15").Lunar().IsSnakeYear() // false
// Whether is a year of the horse
carbon.Parse("2020-08-05 13:14:15").Lunar().IsHorseYear() // false
// Whether is a year of the goat
carbon.Parse("2020-08-05 13:14:15").Lunar().IsGoatYear() // false
// Whether is a year of the monkey
carbon.Parse("2020-08-05 13:14:15").Lunar().IsMonkeyYear() // false
// Whether is a year of the rooster
carbon.Parse("2020-08-05 13:14:15").Lunar().IsRoosterYear() // false
// Whether is a year of the dog
carbon.Parse("2020-08-05 13:14:15").Lunar().IsDogYear() // false
// Whether is a year of the dig
carbon.Parse("2020-08-05 13:14:15").Lunar().IsPigYear() // false

// Get Chinese double-hour
carbon.Parse("2020-02-05 21:00:00").Lunar().DoubleHour() // 亥时

// Whether is FirstDoubleHour
carbon.Parse("2020-03-21 00:00:00").Lunar().IsFirstDoubleHour() // true
// Whether is SecondDoubleHour
carbon.Parse("2020-03-21 01:00:00").Lunar().IsSecondDoubleHour() // true
// Whether is ThirdDoubleHour
carbon.Parse("2020-03-21 03:00:00").Lunar().IsThirdDoubleHour() // true
// Whether is FourthDoubleHour
carbon.Parse("2020-03-21 05:00:00").Lunar().IsFourthDoubleHour() // true
// Whether is FifthDoubleHour
carbon.Parse("2020-03-21 07:00:00").Lunar().IsFifthDoubleHour() // true
// Whether is SixthDoubleHour
carbon.Parse("2020-03-21 09:00:00").Lunar().IsSixthDoubleHour() // true
// Whether is SeventhDoubleHour
carbon.Parse("2020-03-21 11:00:00").Lunar().IsSeventhDoubleHour() // true
// Whether is EighthDoubleHour
carbon.Parse("2020-03-21 13:00:00").Lunar().IsEighthDoubleHour() // true
// Whether is NinthDoubleHour
carbon.Parse("2020-03-21 15:00:00").Lunar().IsNinthDoubleHour() // true
// Whether is TenthDoubleHour
carbon.Parse("2020-03-21 17:00:00").Lunar().IsTenthDoubleHour() // true
// Whether is EleventhDoubleHour
carbon.Parse("2020-03-21 19:00:00").Lunar().IsEleventhDoubleHour() // true
// Whether is TwelfthDoubleHour
carbon.Parse("2020-03-21 21:00:00").Lunar().IsTwelfthDoubleHour() // true
```

##### JSON handling

###### Define model

```go
type Person struct {
    Name string `json:"name"`
    Age int `json:"age"`
    Birthday1 carbon.DateTime `json:"birthday"`
    Birthday2 carbon.DateTimeMilli `json:"birthday"`
    Birthday3 carbon.DateTimeMicro `json:"birthday"`
    Birthday4 carbon.DateTimeNano `json:"birthday"`
    GraduatedAt1 carbon.Date `json:"graduated_at"`
    GraduatedAt2 carbon.DateMilli `json:"graduated_at"`
    GraduatedAt3 carbon.DateMicro `json:"graduated_at"`
    GraduatedAt4 carbon.DateNano `json:"graduated_at"`
    OperatedAt1 carbon.Time `json:"operated_at1"`
    OperatedAt2 carbon.TimeMilli `json:"operated_at2"`
    OperatedAt3 carbon.TimeMicro `json:"operated_at3"`
    OperatedAt4 carbon.TimeNano `json:"operated_at4"`
    CreatedAt1 carbon.Timestamp `json:"created_at1"`
    CreatedAt2 carbon.TimestampMilli `json:"created_at2"`
    CreatedAt3 carbon.TimestampMicro `json:"created_at3"`
    CreatedAt4 carbon.TimestampNano `json:"created_at4"`
}
```

###### Instantiate model
```go
person := Person {
    Name:        "gouguoyin",
    Age:          18,
    Birthday1:    carbon.DateTime{carbon.Now().SubYears(18)},
    Birthday2:    carbon.DateTimeMilli{carbon.Now().SubYears(18)},
    Birthday3:    carbon.DateTimeMicro{carbon.Now().SubYears(18)},
    Birthday4:    carbon.DateTimeNano{carbon.Now().SubYears(18)},
    GraduatedAt1: carbon.Date{carbon.Now()},
    GraduatedAt2: carbon.DateMilli{carbon.Now()},
    GraduatedAt3: carbon.DateMicro{carbon.Now()},
    GraduatedAt4: carbon.DateNano{carbon.Now()},
    OperatedAt1:  carbon.Time{carbon.Now()},
    OperatedAt2:  carbon.TimeMilli{carbon.Now()},
    OperatedAt3:  carbon.TimeMicro{carbon.Now()},
    OperatedAt4:  carbon.TimeNano{carbon.Now()},
    CreatedAt1:   carbon.Timestamp{carbon.Now()},
    CreatedAt2:   carbon.TimestampMilli{carbon.Now()},
    CreatedAt3:   carbon.TimestampMicro{carbon.Now()},
    CreatedAt4:   carbon.TimestampNano{carbon.Now()},
}
```

or

```go
person := Person {
    Name:        "gouguoyin",
    Age:          18,
    Birthday1:    carbon.Now().SubYears(18).ToDateTimeStruct(),
    Birthday2:    carbon.Now().SubYears(18).ToDateTimeMilliStruct(),
    Birthday3:    carbon.Now().SubYears(18).ToDateTimeMicroStruct(),
    Birthday4:    carbon.Now().SubYears(18).ToDateTimeNanoStruct(),
    GraduatedAt1: carbon.Now().ToDateStruct(),
    GraduatedAt2: carbon.Now().ToDateMilliStruct(),
    GraduatedAt3: carbon.Now().ToDateMicroStruct(),
    GraduatedAt4: carbon.Now().ToDateNanoStruct(),
    OperatedAt1:  carbon.Now().ToTimeStruct(),
    OperatedAt2:  carbon.Now().ToTimeMilliStruct(),
    OperatedAt3:  carbon.Now().ToTimeMicroStruct(),
    OperatedAt4:  carbon.Now().ToTimeNanoStruct(),
    CreatedAt1:   carbon.Now().ToTimestampStruct(),
    CreatedAt2:   carbon.Now().ToTimestampMilliStruct(),
    CreatedAt3:   carbon.Now().ToTimestampMicroStruct(),
    CreatedAt4:   carbon.Now().ToTimestampNanoStruct(),
}

```

###### JSON encode

```go
data, err := json.Marshal(&person)
if err != nil {
    // Error handle...
    log.Fatal(err)
}
fmt.Printf("%s", data)
// Output
{
    "name": "gouguoyin",
    "age": 18,
    "birthday1": "2003-07-16 16:22:02",
    "birthday2": "2003-07-16 16:22:02.999",
    "birthday3": "2003-07-16 16:22:02.999999",
    "birthday4": "2003-07-16 16:22:02.999999999",
    "graduated_at1": "2020-08-05",
    "graduated_at2": "2020-08-05.999",
    "graduated_at3": "2020-08-05.999999",
    "graduated_at4": "2020-08-05.999999999",
    "operated_at1": "13:14:15",
    "operated_at2": "13:14:15.999",
    "operated_at3": "13:14:15.999999",
    "operated_at4": "13:14:15.999999999",
    "created_at1": 1596604455,
    "created_at2": 1596604455999,
    "created_at3": 1596604455999999,
    "created_at4": 1596604455999999999
}
```

###### JSON decode

```go
str := `{
    "name": "gouguoyin",
    "age": 18,
    "birthday1": "2003-07-16 16:22:02",
    "birthday2": "2003-07-16 16:22:02.999",
    "birthday3": "2003-07-16 16:22:02.999999",
    "birthday4": "2003-07-16 16:22:02.999999999",
    "graduated_at1": "2020-08-05",
    "graduated_at2": "2020-08-05.999",
    "graduated_at3": "2020-08-05.999999",
    "graduated_at4": "2020-08-05.999999999",
    "operated_at1": "13:14:15",
    "operated_at2": "13:14:15.999",
    "operated_at3": "13:14:15.999999",
    "operated_at4": "13:14:15.999999999",
    "created_at1": 1596604455,
    "created_at2": 1596604455999,
    "created_at3": 1596604455999999,
    "created_at4": 1596604455999999999
}`
person := new(Person)
err := json.Unmarshal([]byte(str), &person)
if err != nil {
    // Error handle...
    log.Fatal(err)
}

person.Birthday1.String() // 2002-08-05 13:14:15
person.Birthday2.String() // 2002-08-05 13:14:15.999
person.Birthday3.String() // 2002-08-05 13:14:15.999999
person.Birthday4.String() // 2002-08-05 13:14:15.999999999

person.GraduatedAt1.String() // 2020-08-05
person.GraduatedAt2.String() // 2020-08-05.999
person.GraduatedAt3.String() // 2020-08-05.999999
person.GraduatedAt4.String() // 2020-08-05.999999999

person.OperatedAt1.String() // 13:14:15
person.OperatedAt2.String() // 13:14:15.999
person.OperatedAt3.String() // 13:14:15.999999
person.OperatedAt4.String() // 13:14:15.999999999

person.CreatedAt1.String() // "1691212455"
person.CreatedAt2.String() // "1722834855999"
person.CreatedAt3.String() // "1754370855999999"
person.CreatedAt4.String() // "1754370855999999999"

person.CreatedAt1.Int64() // 1691212455
person.CreatedAt2.Int64() // 1722834855999
person.CreatedAt3.Int64() // 1754370855999999
person.CreatedAt4.Int64() // 1754370855999999999
```

##### I18n

The following languages are supported

* [Simplified Chinese(zh-CN)](./lang/zh-CN.json "Simplified Chinese")：translated
  by [gouguoyin](https://github.com/gouguoyin "gouguoyin")
* [Traditional Chinese(zh-TW)](./lang/zh-TW.json "Traditional Chinese")：translated
  by [gouguoyin](https://github.com/gouguoyin "gouguoyin")
* [English(en)](./lang/en.json "English")：translated
  by [gouguoyin](https://github.com/gouguoyin "gouguoyin")
* [Japanese(jp)](./lang/jp.json "Japanese")：translated
  by [gouguoyin](https://github.com/gouguoyin "gouguoyin")
* [Korean(kr)](./lang/kr.json "Korean")：translated by [nannul](https://github.com/nannul "nannul")
* [German(de)](./lang/de.json "German")：translated by [benzammour](https://github.com/benzammour "benzammour")
* [Spanish(es)](./lang/es.json "Spanish")：translated by [hgisinger](https://github.com/hgisinger "hgisinger")
* [Turkish(tr)](./lang/tr.json "Turkish"): translated by [emresenyuva](https://github.com/emresenyuva "emresenyuva")
* [Portuguese(pt)](./lang/pt.json "Portuguese"): translated by [felipear89](https://github.com/felipear89 "felipear89")
* [Russian(ru)](./lang/ru.json "Russian"): translated by [zemlyak](https://github.com/zemlyak "zemlyak")
* [Ukrainian(uk)](./lang/uk.json "Ukrainian"): translated by [open-git](https://github.com/open-git "open-git")
* [Romanian(ro)](./lang/ro.json "Romanian"): translated by [DrOctavius](https://github.com/DrOctavius "DrOctavius")
* [Indonesian(id)](./lang/id.json "Indonesian"): translated by [justpoypoy](https://github.com/justpoypoy "justpoypoy")
* [Bahasa Malaysia(ms-MY)](./lang/ms-MY.json "Bahasa Malaysia"): translated
  by [hollowaykeanho](https://github.com/hollowaykeanho "hollowaykeanho")
* [French(fr)](./lang/fr.json "French"): translated
  by [hollowaykeanho](https://github.com/hollowaykeanho "hollowaykeanho")
* [Thailand(th)](./lang/th.json "Thailand"): translated by [izcream](https://github.com/izcream "izcream")
* [Swedish(se)](./lang/se.json "Swedish"): translated by [jwanglof](https://github.com/jwanglof "jwanglof")
* [Iranian(fa)](./lang/fa.json "Iranian"): translated by [erfanMomeniii](https://github.com/erfanMomeniii "erfanMomeniii")
* [Dutch(nl)](./lang/nl.json "Dutch"): translated by [RemcoE33](https://github.com/RemcoE33 "RemcoE33")

The following methods are supported

* `Constellation()`：get constellation name
* `Season()`：get season name
* `DiffForHumans()`：get the difference with human-readable format
* `ToMonthString()`：output month format string
* `ToShortMonthString()`：output short month format string
* `ToWeekString()`：output week format string
* `ToShortWeekString()`：output short week format string

###### Set locale

```go
lang := carbon.NewLanguage()
lang.SetLocale("en")

c := carbon.SetLanguage(lang)
if c.Error != nil {
    // Error handle...
    log.Fatal(err)
}

c.Now().AddHours(1).DiffForHumans() // 1 hour from now
c.Now().AddHours(1).ToMonthString() // August
c.Now().AddHours(1).ToShortMonthString() // Aug
c.Now().AddHours(1).ToWeekString() // Wednesday
c.Now().AddHours(1).ToShortWeekString() // Wed
c.Now().AddHours(1).Constellation() // Leo
c.Now().AddHours(1).Season() // Summer
```

###### Reset some resources(the rests still translate from the given locale)

```go
lang := carbon.NewLanguage()
lang.SetLocale("en")

resources := map[string]string {
    "hour": "%dh",
}
lang.SetResources(resources)

c := carbon.SetLanguage(lang)
if c.Error != nil {
	// Error handle...
	log.Fatal(err)
}

c.Now().AddYears(1).DiffForHumans() // 1 year from now
c.Now().AddHours(1).DiffForHumans() // 1h from now
c.Now().ToMonthString() // August
c.Now().ToShortMonthString() // Aug
c.Now().ToWeekString() // Tuesday
c.Now().ToShortWeekString() // Tue
c.Now().Constellation() // Leo
c.Now().Season() // Summer
```

###### Reset all resources

```go
lang := carbon.NewLanguage()
resources := map[string]string {
    "months": "january|february|march|april|may|june|july|august|september|october|november|december",
    "short_months": "jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec",
    "weeks": "sunday|monday|tuesday|wednesday|thursday|friday|saturday",
    "short_weeks": "sun|mon|tue|wed|thu|fri|sat",
    "seasons": "spring|summer|autumn|winter",
    "constellations": "aries|taurus|gemini|cancer|leo|virgo|libra|scorpio|sagittarius|capricornus|aquarius|pisce",
    "year": "1 yr|%d yrs",
    "month": "1 mo|%d mos",
    "week": "%dw",
    "day": "%dd",
    "hour": "%dh",
    "minute": "%dm",
    "second": "%ds",
    "now": "just now",
    "ago": "%s ago",
    "from_now": "in %s",
    "before": "%s before",
    "after": "%s after",
}
lang.SetResources(resources)

c := carbon.SetLanguage(lang)
c.Now().AddYears(1).DiffForHumans() // in 1 yr
c.Now().AddHours(1).DiffForHumans() // in 1h
c.Now().ToMonthString() // august
c.Now().ToShortMonthString() // aug
c.Now().ToWeekString() // tuesday
c.Now().ToShortWeekString() // tue
c.Now().Constellation() // leo
c.Now().Season() // summer
```

##### Testing

```go
testNow := carbon.Parse("2020-08-05")

carbon.SetTestNow(testNow).Yesterday().ToDateString() // 2020-08-04
carbon.SetTestNow(testNow).Now().ToDateString() // 2020-08-05
carbon.SetTestNow(testNow).Tomorrow().ToDateString() // 2020-08-06
carbon.SetTestNow(testNow).Parse("2000-08-05").Age() // 30

carbon.Now().HasTestNow() // false
carbon.SetTestNow(testNow).HasTestNow() // true
carbon.SetTestNow(testNow).ClearTestNow().HasTestNow() // false

```

##### Error handling

> If more than one error occurs, only the first error is returned

```go
c := carbon.SetTimezone("xxx").Parse("2020-08-05")
if c.Error != nil {
    // Error handle...
    log.Fatal(c.Error)
}
fmt.Println(c.ToDateTimeString())
// Output
invalid timezone "xxx", please see the file "$GOROOT/lib/time/zoneinfo.zip" for all valid timezones
```

#### Appendix

##### <a id="format-sign-table">Format sign table</a>

| sign |                                                        desc                                                        | length |      range       |             example             |
| :------------: |:------------------------------------------------------------------------------------------------------------------:|:------:|:----------------:|:-------------------------------:|
| d |                                           Day of the month, padded to 2                                            |   2    |      01-31       |               02                |
| D |                                 Day of the week, as an abbreviate localized string                                 |   3    |     Mon-Sun      |               Mon               |
| j |                                            Day of the month, no padding                                            |   -    |       1-31       |                2                |
| S |       English ordinal suffix for the day of the month, 2 characters. Eg: st, nd, rd or th. Works well with j       |   2    |   st/nd/rd/th    |               th                |
| l |                               Day of the week, as an unabbreviated localized string                                |   -    |  Monday-Sunday   |             Monday              |
| F |                                     Month as an unabbreviated localized string                                     |   -    | January-December |             January             |
| m |                                                 Month, padded to 2                                                 |   2    |      01-12       |               01                |
| M |                                      Month as an abbreviated localized string                                      |   3    |     Jan-Dec      |               Jan               |
| n |                                                 Month, no padding                                                  |   -    |       1-12       |                1                |
| Y |                                                  Four-digit year                                                   |   4    |    0000-9999     |              2006               |
| y |                                                   Two-digit year                                                   |   2    |      00-99       |               06                |
| a |                                        Lowercase morning or afternoon sign                                         |   2    |      am/pm       |               pm                |
| A |                                        Uppercase morning or afternoon sign                                         |   2    |      AM/PM       |               PM                |
| g |                                         Hour in 12-hour format, no padding                                         |   -    |       1-12       |                3                |
| G |                                         Hour in 24-hour format, no padding                                         |   -    |       0-23       |               15                |
| h |                                        Hour in 12-hour format, padded to 2                                         |   2    |      00-11       |               03                |
| H |                                        Hour in 24-hour format, padded to 2                                         |   2    |      00-23       |               15                |
| i |                                                Minute, padded to 2                                                 |   2    |      01-59       |               04                |
| s |                                                Second, padded to 2                                                 |   2    |      01-59       |               05                |
| c |                                                    ISO8601 date                                                    |   -    |        -         |    2006-01-02T15:04:05-07:00    |
| r |                                                    RFC2822 date                                                    |   -    |        -         | Mon, 02 Jan 2006 15:04:05 -0700 |
| O |                     Difference to Greenwich time (GMT) without colon between hours and minutes                     |   -    |        -         |              +0700              |
| P |                      Difference to Greenwich time (GMT) with colon between hours and minutes                       |   -    |        -         |             +07:00              |
| T |                                                Abbreviated timezone                                                |   -    |        -         |               MST               |
| W |                                       week of the year, padded to 2                                        |   2    |      01-52       |               01                |
| N |                                        day of the week, padded to 2                                        |   2    |      01-07       |               02                |
| L |                                              Whether it's a leap year                                              |   1    |       0-1        |                0                |
| U |                                            Unix timestamp with seconds                                             |   10   |        -         |           1611818268            |
| u |                                                    Millisecond                                                     |   -    |      1-999       |               999               |
| w |                                                  Day of the week                                                   |   1    |       0-6        |                1                |
| t |                                              Total days of the month                                               |   2    |      28-31       |               31                |
| z |                                                  Day of the year                                                   |   -    |      1-365       |                2                |
| e |                                                      Location                                                      |   -    |        -         |        America/New_York         |
| Q |                                                      Quarter                                                       |   1    |       1-4        |                1                |
| C |                                                      Century                                                       |   -    |       0-99       |               21                |

#### FAQ

1、What is the difference between v1 and v2?
> There is no difference between v1 and v2 of the API, but the implementation of the translation resource files in `language.go` is different. The v1 is implemented by the third-party extension library [packr](https://github.com/gobuffalo/packr), and the v2 is implemented by the standard library [embed](https://pkg.go.dev/embed) after `golang1.16`. If your golang version is `1.16+`, the v2 is recommended, otherwise, the v1 is required.

#### References

* [briannesbitt/carbon](https://github.com/briannesbitt/Carbon)
* [jinzhu/now](https://github.com/jinzhu/now)
* [goframe/gtime](https://github.com/gogf/gf/tree/master/os/gtime)
* [jodaOrg/joda-time](https://github.com/jodaOrg/joda-time)
* [arrow-py/arrow](https://github.com/arrow-py/arrow)
* [moment/moment](https://github.com/moment/moment)
* [iamkun/dayjs](https://github.com/iamkun/dayjs)

#### Contributors
Thanks to all of the following who contributed to `Carbon`:

<a href="https://github.com/golang-module/carbon/graphs/contributors"><img src="https://contrib.rocks/image?repo=golang-module/carbon&max=100&columns=16" /></a>

#### Sponsors

`Carbon` is a non-commercial open source project. If you want to support `Carbon`, you can [buy a cup of coffee](https://opencollective.com/go-carbon) for developer.

#### Thanks

`Carbon` had been being developed with GoLand under the free JetBrains Open Source license, I would like to express my
thanks here.

<a href="https://www.jetbrains.com"><img src="https://raw.githubusercontent.com/panjf2000/illustrations/master/jetbrains/jetbrains-variant-4.png" height="100" alt="JetBrains"/></a>