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2023-10-16 14:07:00 +08:00

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Carbon

English | 简体中文 | 日本語

Introduction

A simple, semantic and developer-friendly golang package for datetime, has been included by awesome-go

github.com/golang-module/carbon

gitee.com/golang-module/carbon

Installation

// 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)

// 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 FAQ for the difference between v1 and v2

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

// 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

// 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

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

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

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

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

Start and end

// 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

// 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

// 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

// 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

// 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

// 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

// 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 Format sign table

Constellation

// 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

// 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

// 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

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

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()},
}

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

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

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)：translated by gouguoyin
Traditional Chinese(zh-TW)：translated by gouguoyin
English(en)：translated by gouguoyin
Japanese(jp)：translated by gouguoyin
Korean(kr)：translated by nannul
German(de)：translated by benzammour
Spanish(es)：translated by hgisinger
Turkish(tr): translated by emresenyuva
Portuguese(pt): translated by felipear89
Russian(ru): translated by zemlyak
Ukrainian(uk): translated by open-git
Romanian(ro): translated by DrOctavius
Indonesian(id): translated by justpoypoy
Bahasa Malaysia(ms-MY): translated by hollowaykeanho
French(fr): translated by hollowaykeanho
Thailand(th): translated by izcream
Swedish(se): translated by jwanglof
Iranian(fa): translated by erfanMomeniii

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

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)

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

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

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

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

Format sign table

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, and the v2 is implemented by the standard library embed after golang1.16. If your golang version is 1.16+, the v2 is recommended, otherwise, the v1 is required.

References

Contributors

Thanks to all of the following who contributed to Carbon:

Thanks

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

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