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gouguoyin 5e73299843 Duration()拆分成AddDuration()和SubDuration()
2020-11-03 07:41:50 +08:00
calendar_test.go 100%单元测试覆盖率 2020-10-11 10:51:15 +08:00
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database_test.go 版本重构 2020-10-10 16:11:22 +08:00
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README.en.md Duration()拆分成AddDuration()和SubDuration() 2020-11-03 07:41:50 +08:00
README.md Duration()拆分成AddDuration()和SubDuration() 2020-11-03 07:41:50 +08:00

README.en.md

Carbon

English | Chinese

Description

A simple,semantic and developer-friendly golang package for datetime

If you feel good, please give me a star

github:github.com/golang-module/carbon

gitee:gitee.com/go-package/carbon

Installation

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

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

// By gitee
go get -u gitee.com/go-package/carbon

import (
    "gitee.com/go-package/carbon"
)

Usage and example

The default timezone is Local, assuming the current time is 2020-08-05 13:14:15

Yesterday,today and tomorrow
// Datetime of today
carbon.Now().ToDateTimeString() // 2020-08-05 13:14:15
// Date of today
carbon.Now().ToDateString() // 2020-08-05
// Time of today
carbon.Now().ToTimeString() // 13:14:15
// Timestamp of today
carbon.Now().ToTimestamp() // 1596604455

// Datetime of yesterday
carbon.Yesterday().ToDateTimeString() // 2020-08-04 13:14:15
// Date of yesterday
carbon.Yesterday().ToDateString() // 2020-08-04
// Time of yesterday
carbon.Yesterday().ToTimeString() // 13:14:15
// Timestamp of yesterday
carbon.Yesterday().ToTimestamp() // 1596518055

// Datetime of tomorrow
carbon.Tomorrow().ToDateTimeString() // 2020-08-06 13:14:15
// Date of tomorrow
carbon.Tomorrow().ToDateString() // 2020-08-06
// Time of tomorrow
carbon.Tomorrow().ToTimeString() // 13:14:15
// Timestamp of tomorrow
carbon.Tomorrow().ToTimestamp() // 1596690855
Create carbon instance
// Create Carbon instance from timestamp with second
carbon.CreateFromTimestamp(1596604455).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from timestamp with millisecond
carbon.CreateFromTimestamp(1596604455000).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from timestamp with microsecond
carbon.CreateFromTimestamp(1596604455000000).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from timestamp with nanosecond
carbon.CreateFromTimestamp(1596604455000000000).ToDateTimeString() // 2020-08-05 13:14:15

// Create Carbon instance from year,month,day,hour,minute and second
carbon.CreateFromDateTime(2020, 8, 5, 13, 14, 15).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from year,month and day
carbon.CreateFromDate(2020, 8, 5).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from hour,minute and second
carbon.CreateFromTime(13, 14, 15).ToDateTimeString() // 2020-08-05 13:14:15
// Create Carbon instance from golang time.Time instance
carbon.CreateFromGoTime(time.Now()).ToTimestamp() // 1596604455
Parse standard time format string
carbon.Parse("").ToDateTimeString() // empty string
carbon.Parse("0000-00-00 00:00:00").ToDateTimeString() // empty string
carbon.Parse("0000-00-00").ToDateTimeString() // empty string
carbon.Parse("2020-08-05 13:14:15").ToDateTimeString() // 2020-08-05 13:14:15
carbon.Parse("2020-08-05").ToDateTimeString() // 2020-08-05 00:00:00
carbon.Parse("20200805131415").ToDateTimeString() // 2020-08-05 13:14:15
carbon.Parse("20200805").ToDateTimeString() // 2020-08-05 00:00:00
carbon.Parse("2020-08-05T13:14:15+08:00").ToDateTimeString() // 2020-08-05 00:00:00
Parse custom time format string
carbon.ParseByFormat("2020|08|05 13|14|15", "Y|m|d H|i|s").ToDateTimeString // 2020-08-05 13:14:15
carbon.ParseByFormat("2020%08%05% 13%14%15", "Y%m%d% h%i%s").ToDateTimeString // 2020-08-05 13:14:15
carbon.ParseByFormat("2020年08月05日 13时14分15秒", "Y年m月d日 H时i分s秒").ToDateTimeString() // 2020-08-05 13:14:15
carbon.ParseByFormat("2020年08月05日", "Y年m月d日").ToDateTimeString() // 2020-08-05 00:00:00
carbon.ParseByFormat("13时14分15秒", "H时i分s秒").ToDateTimeString() // 2020-08-05 13:14:15
Parse duration time string (base on now)
// Ten hours later
carbon.ParseByDuration("10h").ToDateTimeString() // 2020-08-06 23:14:15
// Ten and a half hours ago
carbon.ParseByDuration("-10.5h").ToDateTimeString // 2020-08-05 02:44:15
// Ten minutes later
carbon.ParseByDuration("10m").ToDateTimeString // 2020-08-05 13:24:15
// Ten and a half minutes ago
carbon.ParseByDuration("-10.5m").ToDateTimeString // 2020-08-05 13:03:45
// Ten seconds later
carbon.ParseByDuration("10s").ToDateTimeString // 2020-08-05 13:14:25
// Ten seconds ago
carbon.ParseByDuration("-10.5s").ToDateTimeString // 2020-08-05 13:14:04
Time 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).SetTimezone(carbon.PRC).Now().ToDateTimeString() // 2020-08-05 13:14:15

// Set year
carbon.Parse("2019-08-05").SetYear(2020).ToDateString() // 2020-08-05
carbon.Parse("2020-02-29").SetYear(2019).ToDateString() // 2019-03-01

// Set month
carbon.Parse("2020-01-30").SetMonth(2).ToDateString() // 2020-03-01
carbon.Parse("2020-01-31").SetMonth(2).ToDateString() // 2020-03-02
carbon.Parse("2020-08-05").SetMonth(2).ToDateString() // 2020-02-05

// 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

For more timezone constants, please see the const.go file

Start and end
// 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 month
carbon.Parse("2020-08-05 13:14:15").StartOfMonth().ToStartTimeString() // 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() // 2020-08-03 00:00:00
// End of the week
carbon.Parse("2020-08-05 13:14:15").LastOfWeek().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
Time travel
// Add three years
carbon.Parse("2020-02-29 13:14:15").AddYears(3).ToDateTimeString() // 2023-03-01 13:14:15
// Next three years
carbon.Parse("2020-02-29 13:14:15").NextYears(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
// Next one year
carbon.Parse("2020-02-29 13:14:15").NextYear().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
// Previous three years
carbon.Parse("2020-02-29 13:14:15").PreYears(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
// Previous one year
carbon.Parse("2020-02-29 13:14:15").PreYear().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
// Next three quarters
carbon.Parse("2019-08-31 13:14:15").NextQuarters(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
// Next one quarter
carbon.Parse("2019-11-30 13:14:15").NextQuarter().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
// Previous three quarters
carbon.Parse("2019-08-31 13:14:15").PreQuarters(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
// Previous one quarter
carbon.Parse("2020-05-31 13:14:15").PreQuarter().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
// Next three months
carbon.Parse("2020-02-29 13:14:15").NextMonths(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
// Next one month
carbon.Parse("2020-01-31 13:14:15").NextMonth().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
// Previous three months
carbon.Parse("2020-02-29 13:14:15").PreMonths(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
// Previous one month
carbon.Parse("2020-03-31 13:14:15").PreMonth().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
// 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
// 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
// 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
Time difference
// Difference in weeks
carbon.Parse("2020-08-05 13:14:15").DiffInWeeks(carbon.Parse("2020-07-28 13:14:15")) // -1
// Difference absolute in weeks
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 absolute in days
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 absolute in hours
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 absolute in minutes
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 absolute in seconds
carbon.Parse("2020-08-05 13:14:15").DiffAbsInSeconds(carbon.Parse("2020-08-05 13:14:14")) // 1
Time output
// To timestamp with second
carbon.Parse("2020-08-05 13:14:15").ToTimestamp() // 1596604455
carbon.Parse("2020-08-05 13:14:15").ToTimestampWithSecond() // 1596604455
// To timestamp with millisecond
carbon.Parse("2020-08-05 13:14:15").ToTimestampWithMillisecond() // 1596604455000
// To timestamp with microsecond
carbon.Parse("2020-08-05 13:14:15").ToTimestampWithMicrosecond() // 1596604455000000
// To timestamp with nanosecond
carbon.Parse("2020-08-05 13:14:15").ToTimestampWithNanosecond() // 1596604455000000000

// To string
carbon.Parse("2020-08-05 13:14:15").Time.String() // 2020-08-05 13:14:15 +0800 CST
// To string of layout format
carbon.Parse("2020-08-05 13:14:15").ToFormatString("YmdHis") // 20200805131415
carbon.Parse("2020-08-05 13:14:15").ToFormatString("Y年m月d H时i分s秒") // 2020年08月05日 13时14分15秒
// To string of datetime format
carbon.Parse("2020-08-05 13:14:15").ToDateTimeString() // 2020-08-05 13:14:15
// To string of date format
carbon.Parse("2020-08-05 13:14:15").ToDateString() // 2020-08-05
// To string of time format
carbon.Parse("2020-08-05 13:14:15").ToTimeString() // 13:14:15

// To string of Ansic format
carbon.Parse("2020-08-05 13:14:15").ToAnsicString() // Wed Aug  5 13:14:15 2020
// To string of Atom format
carbon.Parse("2020-08-05 13:14:15").ToAtomString() // Wed Aug  5 13:14:15 2020
// To string of UnixDate format  
carbon.Parse("2020-08-05 13:14:15").ToUnixDateString() // Wed Aug  5 13:14:15 CST 2020
// To string of RubyDate format 
carbon.Parse("2020-08-05 13:14:15").ToRubyDateString() // Wed Aug 05 13:14:15 +0800 2020
// To string of Kitchen format
carbon.Parse("2020-08-05 13:14:15").ToKitchenString() // 1:14PM
// To string of Cookie format
carbon.Parse("2020-08-05 13:14:15").ToCookieString() // Wednesday, 05-Aug-2020 13:14:15 CST
// To string of DayDateTime format
carbon.Parse("2020-08-05 13:14:15").ToDayDateTimeString() // Wed, Aug 5, 2020 1:14 PM
// To string of RSS format
carbon.Parse("2020-08-05 13:14:15").ToRssString() // Wed, 05 Aug 2020 13:14:15 +0800
// To string of W3C format
carbon.Parse("2020-08-05 13:14:15").ToW3cString() // 2020-08-05T13:14:15+08:00

// To string of RFC822 format
carbon.Parse("2020-08-05 13:14:15").ToRFC822String() // 05 Aug 20 13:14 CST
// To string of RFC822Z format
carbon.Parse("2020-08-05 13:14:15").ToRFC822zString() // 05 Aug 20 13:14 +0800
// To string of RFC850 format
carbon.Parse("2020-08-05 13:14:15").ToRFC850String() // Wednesday, 05-Aug-20 13:14:15 CST
// To string of RFC1036 format
carbon.Parse("2020-08-05 13:14:15").ToRFC1036String() // Wed, 05 Aug 20 13:14:15 +0800
// To string of RFC1123 format
carbon.Parse("2020-08-05 13:14:15").ToRFC1123String() // Wed, 05 Aug 2020 13:14:15 CST
// To string of RFC2822 format
carbon.Parse("2020-08-05 13:14:15").ToRFC2822String() // Wed, 05 Aug 2020 13:14:15 +0800
// To string of RFC3339 format 
carbon.Parse("2020-08-05 13:14:15").ToRFC3339String() // 2020-08-05T13:14:15+08:00
// To string of RFC7231 format
carbon.Parse("2020-08-05 13:14:15").ToRFC7231String() // Wed, 05 Aug 2020 05:14:15 GMT

For more format signs, please see the Format sign table

Time 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
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 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 timezone name
carbon.SetTimezone(carbon.PRC).Timezone() // PRC
carbon.SetTimezone(carbon.Tokyo).Timezone() // Asia/Tokyo

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

// Is now time
carbon.Parse(carbon.Now().ToDateTimeString()).IsNow() // true
// Is future time
carbon.Parse("2020-08-06 13:14:15").IsFuture() // true
// Is pass time
carbon.Parse("2020-08-04 13:14:15").IsPast() // true

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

// Is january 
carbon.Parse("2020-08-05 13:14:15").IsJanuary() // false
// Is february
carbon.Parse("2020-08-05 13:14:15").IsFebruary() // false
// Is march
carbon.Parse("2020-08-05 13:14:15").IsMarch() // false
// Is april
carbon.Parse("2020-08-05 13:14:15").IsApril()  // false
// Is may
carbon.Parse("2020-08-05 13:14:15").IsMay() // false
// Is june
carbon.Parse("2020-08-05 13:14:15").IsJune() // false
// Is july
carbon.Parse("2020-08-05 13:14:15").IsJuly() // false
// Is august
carbon.Parse("2020-08-05 13:14:15").IsAugust() // false
// Is september
carbon.Parse("2020-08-05 13:14:15").IsSeptember() // true
// Is october
carbon.Parse("2020-08-05 13:14:15").IsOctober() // false
// Is november
carbon.Parse("2020-08-05 13:14:15").IsNovember() // false
// Is december
carbon.Parse("2020-08-05 13:14:15").IsDecember() // false

// Is monday
carbon.Parse("2020-08-05 13:14:15").IsMonday() // false
// Is tuesday
carbon.Parse("2020-08-05 13:14:15").IsTuesday() // true
// Is wednesday
carbon.Parse("2020-08-05 13:14:15").IsWednesday() // false
// Is thursday
carbon.Parse("2020-08-05 13:14:15").IsThursday()  // false
// Is friday
carbon.Parse("2020-08-05 13:14:15").IsFriday() // false
// Is saturday
carbon.Parse("2020-08-05 13:14:15").IsSaturday() // false
// Is sunday
carbon.Parse("2020-08-05 13:14:15").IsSunday() // false
// Is weekday
carbon.Parse("2020-08-05 13:14:15").IsWeekday() // false
// Is weekend
carbon.Parse("2020-08-05 13:14:15").IsWeekend() // true

// 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
// 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
// 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
Calendar
// To year of the animal
carbon.Parse("2020-08-05 13:14:15").ToAnimalYear() // 鼠
// To lunar year
carbon.Parse("2020-08-05 13:14:15").ToLunarYear() // 庚子

// Is year of the rat
carbon.Parse("2020-08-05 13:14:15").IsYearOfRat() // true
// Is year of the ox
carbon.Parse("2020-08-05 13:14:15").IsYearOfOx() // false
// Is year of the tiger
carbon.Parse("2020-08-05 13:14:15").IsYearOfTiger() // false
// Is year of the rabbit
carbon.Parse("2020-08-05 13:14:15").IsYearOfRabbit() // false
// Is year of the dragon
carbon.Parse("2020-08-05 13:14:15").IsYearOfDragon() // false
// Is year of the snake
carbon.Parse("2020-08-05 13:14:15").IsYearOfSnake() // false
// Is year of the horse
carbon.Parse("2020-08-05 13:14:15").IsYearOfHorse() // false
// Is year of the goat
carbon.Parse("2020-08-05 13:14:15").IsYearOfGoat() // false
// Is year of the monkey
carbon.Parse("2020-08-05 13:14:15").IsYearOfMonkey() // false
// Is year of the rooster
carbon.Parse("2020-08-05 13:14:15").IsYearOfRooster() // false
// Is year of the dog
carbon.Parse("2020-08-05 13:14:15").IsYearOfDog() // false
// Is year of the dig
carbon.Parse("2020-08-05 13:14:15").IsYearOfPig() // false
Database

Assuming the database table is users, its fields have id(int), name(varchar), age(int), graduated_at(date), birthday(date), created_at(datetime), updated_at(datetime), deleted_at(datetime)

Define model
type UserModel struct {
    ID  int64  `json:"id"`
    Name string `json:"name"`
    Age int `json:"age"`
    Birthday carbon.Carbon `json:"birthday"`
    CreatedAt carbon.ToDateTimeString `json:"created_at"`
    DeletedAt carbon.ToTimestamp `json:"deleted_at"`
    GraduatedAt carbon.ToDateString `json:"graduated_at"`
    UpdatedAt carbon.ToTimeString `json:"updated_at"`
}
Instantiate model
user := UserModel {
    Name: "勾国印",
    Age: 18,
    Birthday: carbon.Now().SubYears(18),
    CreatedAt: carbon.ToDateTimeString{carbon.Now()},
    DeletedAt: carbon.ToTimestamp{carbon.Parse("2020-08-05 13:14:15")},
    GraduatedAt: carbon.ToDateString{carbon.Parse("2012-09-09")},
    UpdatedAt: carbon.ToTimeString{carbon.Now()},
}
Output fields
user.ID // 18
user.Name // 勾国印
user.Birthday.ToDateString() // 2012-08-05
user.CreatedAt.ToTimestamp() // 1596604455 
user.DeletedAt.ToDateTimeString() // 2012-08-05 13:14:15
user.GraduatedAt.AddDay().ToDateString() // 2012-09-10
user.UpdatedAt.ToDateString() // 2012-08-05
Output model by json
data, _ := json.Marshal(&user)
fmt.Print(string(data))
// Output
{
    "id": 42,
    "name": "勾国印",
    "age": 18,
    "birthday": "2012-08-05 00:00:00",
    "created_at": "2020-08-05 13:14:15",
    "deleted_at": 1596604455
    "graduated_at": "2012-09-09",
    "updated_at": "13:14:15",
}
Output custom format
// Define format
type ToRssString struct {
    carbon.Carbon
}

// Define model
type UserModel struct {
    Birthday ToRssString `json:"birthday"`
}

// Instantiate model
user := UserModel {
    Birthday: ToRssString{carbon.Now()},
}

// Overload MarshalJSON method
func (c ToRssString) MarshalJSON() ([]byte, error) {
	return []byte(fmt.Sprintf(`"%s"`, c.ToRssString())), nil
}

// Output model by json.Marshal(&user)
{
    "birthday": "Wed, 05 Aug 2020 13:14:15 +0800",
}

Appendix

Format sign table
sign desc type length range example
Y year number 4 0000-9999 2020
y year number 2 00-99 20
M month letter 3 Jan-Dec Aug
m month number 2 01-12 08
F month letter - January-December August
n month number 1/2 1-12 8
l weekday letter - Monday-Sunday Wednesday
D weekday letter 3 Mon-Sun Wed
d day number 2 01-31 05
j day number 1/2 1-31 5
H hour number 2 00-23 15
h hour number 2 00-11 03
i minute number 2 01-59 14
s second number 2 01-59 15
P Ante Meridiem/Post Meridiem letter 2 AM/PM PM
p ante meridiem/post meridiem letter 2 am/pm pm

Reference