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lancet/docs/datetime.md
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# Datetime
Package datetime supports date and time format and compare.
<div STYLE="page-break-after: always;"></div>
## Source:
- [https://github.com/duke-git/lancet/blob/main/datetime/datetime.go](https://github.com/duke-git/lancet/blob/main/datetime/datetime.go)
- [https://github.com/duke-git/lancet/blob/main/datetime/conversion.go](https://github.com/duke-git/lancet/blob/main/datetime/conversion.go)
<div STYLE="page-break-after: always;"></div>
## Usage:
```go
import (
"github.com/duke-git/lancet/v2/datetime"
)
```
<div STYLE="page-break-after: always;"></div>
## Index
- [AddDay](#AddDay)
- [AddHour](#AddHour)
- [AddMinute](#AddMinute)
- [BeginOfMinute](#BeginOfMinute)
- [BeginOfHour](#BeginOfHour)
- [BeginOfDay](#BeginOfDay)
- [BeginOfWeek](#BeginOfWeek)
- [BeginOfMonth](#BeginOfMonth)
- [BeginOfYear](#BeginOfYear)
- [EndOfMinute](#EndOfMinute)
- [EndOfHour](#EndOfHour)
- [EndOfDay](#EndOfDay)
- [EndOfWeek](#EndOfWeek)
- [EndOfMonth](#EndOfMonth)
- [EndOfYear](#EndOfYear)
- [GetNowDate](#GetNowDate)
- [GetNowTime](#GetNowTime)
- [GetNowDateTime](#GetNowDateTime)
- [GetZeroHourTimestamp](#GetZeroHourTimestamp)
- [GetNightTimestamp](#GetNightTimestamp)
- [FormatTimeToStr](#FormatTimeToStr)
- [FormatStrToTime](#FormatStrToTime)
- [NewUnixNow](#NewUnixNow)
- [NewUnix](#NewUnix)
- [NewFormat](#NewFormat)
- [NewISO8601](#NewISO8601)
- [ToUnix](#ToUnix)
- [ToFormat](#ToFormat)
- [ToFormatForTpl](#ToFormatForTpl)
- [ToIso8601](#ToIso8601)
<div STYLE="page-break-after: always;"></div>
## Documentation
## Note:
1. 'format' string param in func FormatTimeToStr and FormatStrToTime function should be one of flows:
- yyyy-mm-dd hh:mm:ss
- yyyy-mm-dd hh:mm
- yyyy-mm-dd hh
- yyyy-mm-dd
- yyyy-mm
- mm-dd
- dd-mm-yy hh:mm:ss
- yyyy/mm/dd hh:mm:ss
- yyyy/mm/dd hh:mm
- yyyy-mm-dd hh
- yyyy/mm/dd
- yyyy/mm
- mm/dd
- dd/mm/yy hh:mm:ss
- yyyy
- mm
- hh:mm:ss
- mm:ss
### <span id="AddDay">AddDay</span>
<p>Add or sub days to time.</p>
<b>Signature:</b>
```go
func AddDay(t time.Time, day int64) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
tomorrow := datetime.AddDay(now, 1)
diff1 := tomorrow.Sub(now)
yesterday := datetime.AddDay(now, -1)
diff2 := yesterday.Sub(now)
fmt.Println(diff1)
fmt.Println(diff2)
// Output:
// 24h0m0s
// -24h0m0s
}
```
### <span id="AddHour">AddHour</span>
<p>Add or sub hours to time.</p>
<b>Signature:</b>
```go
func AddHour(t time.Time, hour int64) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
after2Hours := datetime.AddHour(now, 2)
diff1 := after2Hours.Sub(now)
before2Hours := datetime.AddHour(now, -2)
diff2 := before2Hours.Sub(now)
fmt.Println(diff1)
fmt.Println(diff2)
// Output:
// 2h0m0s
// -2h0m0s
}
```
### <span id="AddMinute">AddMinute</span>
<p>Add or sub minutes to time.</p>
<b>Signature:</b>
```go
func AddMinute(t time.Time, minute int64) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
after2Minutes := datetime.AddMinute(now, 2)
diff1 := after2Minutes.Sub(now)
before2Minutes := datetime.AddMinute(now, -2)
diff2 := before2Minutes.Sub(now)
fmt.Println(diff1)
fmt.Println(diff2)
// Output:
// 2m0s
// -2m0s
}
```
### <span id="BeginOfMinute">BeginOfMinute</span>
<p>Return beginning minute time of day.</p>
<b>Signature:</b>
```go
func BeginOfMinute(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfMinute(input)
fmt.Println(result)
// Output:
// 2023-01-08 18:50:00 +0000 UTC
}
```
### <span id="BeginOfHour">BeginOfHour</span>
<p>Return zero time of day.</p>
<b>Signature:</b>
```go
func BeginOfHour(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfHour(input)
fmt.Println(result)
// Output:
// 2023-01-08 18:00:00 +0000 UTC
}
```
### <span id="BeginOfDay">BeginOfDay</span>
<p>Return begin time of day.</p>
<b>Signature:</b>
```go
func BeginOfDay(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfDay(input)
fmt.Println(result)
// Output:
// 2023-01-08 00:00:00 +0000 UTC
}
```
### <span id="BeginOfWeek">BeginOfWeek</span>
<p>Return beginning time of week, week begin from Sunday.</p>
<b>Signature:</b>
```go
func BeginOfWeek(t time.Time, beginFrom ...time.Weekday) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfWeek(input)
fmt.Println(result)
// Output:
// 2023-01-08 00:00:00 +0000 UTC
}
```
### <span id="BeginOfMonth">BeginOfMonth</span>
<p>Return beginning time of month</p>
<b>Signature:</b>
```go
func BeginOfMonth(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfMonth(input)
fmt.Println(result)
// Output:
// 2023-01-01 00:00:00 +0000 UTC
}
```
### <span id="BeginOfYear">BeginOfYear</span>
<p>Return beginning time of year.</p>
<b>Signature:</b>
```go
func BeginOfYear(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.BeginOfYear(input)
fmt.Println(result)
// Output:
// 2023-01-01 00:00:00 +0000 UTC
}
```
### <span id="EndOfMinute">EndOfMinute</span>
<p>Return end time minute of day.</p>
<b>Signature:</b>
```go
func EndOfMinute(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfMinute(input)
fmt.Println(result)
// Output:
// 2023-01-08 18:50:59.999999999 +0000 UTC
}
```
### <span id="EndOfHour">EndOfHour</span>
<p>Return end time hour of day.</p>
<b>Signature:</b>
```go
func EndOfHour(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfHour(input)
fmt.Println(result)
// Output:
// 2023-01-08 18:59:59.999999999 +0000 UTC
}
```
### <span id="EndOfDay">EndOfDay</span>
<p>Return end time hour of day.</p>
<b>Signature:</b>
```go
func EndOfDay(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfDay(input)
fmt.Println(result)
// Output:
// 2023-01-08 23:59:59.999999999 +0000 UTC
}
```
### <span id="EndOfWeek">EndOfWeek</span>
<p>Return end time of week, week end with Saturday.</p>
<b>Signature:</b>
```go
func EndOfWeek(t time.Time, endWith ...time.Weekday) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfWeek(input)
fmt.Println(result)
// Output:
// 2023-01-14 23:59:59.999999999 +0000 UTC
}
```
### <span id="EndOfMonth">EndOfMonth</span>
<p>Return end time of month</p>
<b>Signature:</b>
```go
func EndOfMonth(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfMonth(input)
fmt.Println(result)
// Output:
// 2023-01-31 23:59:59.999999999 +0000 UTC
}
```
### <span id="EndOfYear">EndOfYear</span>
<p>Return beginning time of year.</p>
<b>Signature:</b>
```go
func EndOfYear(t time.Time) time.Time
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
input := time.Date(2023, 1, 8, 18, 50, 10, 100, time.UTC)
result := datetime.EndOfYear(input)
fmt.Println(result)
// Output:
// 2023-12-31 23:59:59.999999999 +0000 UTC
}
```
### <span id="GetNowDate">GetNowDate</span>
<p>Get current date string, format is yyyy-mm-dd.</p>
<b>Signature:</b>
```go
func GetNowDate() string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
currentDate := datetime.GetNowDate()
fmt.Println(currentDate)
// Output:
// 2022-01-28
}
```
### <span id="GetNowTime">GetNowTime</span>
<p>Get current time string, format is hh:mm:ss.</p>
<b>Signature:</b>
```go
func GetNowTime() string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
currentTime := datetime.GetNowTime()
fmt.Println(currentTime) // 15:57:33
// Output:
// 15:57:33
}
```
### <span id="GetNowDateTime">GetNowDateTime</span>
<p>Get current date time string, format is yyyy-mm-dd hh:mm:ss.</p>
<b>Signature:</b>
```go
func GetNowDateTime() string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
current := datetime.GetNowDateTime()
fmt.Println(current)
// Output:
// 2022-01-28 15:59:33
}
```
### <span id="GetZeroHourTimestamp">GetZeroHourTimestamp</span>
<p>Return timestamp of zero hour (timestamp of 00:00).</p>
<b>Signature:</b>
```go
func GetZeroHourTimestamp() int64
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
zeroTime := datetime.GetZeroHourTimestamp()
fmt.Println(zeroTime)
// Output:
// 1643299200
}
```
### <span id="GetNightTimestamp">GetNightTimestamp</span>
<p>Return timestamp of zero hour (timestamp of 23:59).</p>
<b>Signature:</b>
```go
func GetNightTimestamp() int64
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
now := time.Now()
nightTime := datetime.GetNightTimestamp()
fmt.Println(nightTime)
// Output:
// 1643385599
}
```
### <span id="FormatTimeToStr">FormatTimeToStr</span>
<p>Format time to string, `format` param specification see note 1.</p>
<b>Signature:</b>
```go
func FormatTimeToStr(t time.Time, format string) string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"time"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
t, _ := time.Parse("2006-01-02 15:04:05", "2021-01-02 16:04:08")
result1 := datetime.FormatTimeToStr(t, "yyyy-mm-dd hh:mm:ss")
result2 := datetime.FormatTimeToStr(t, "yyyy-mm-dd")
result3 := datetime.FormatTimeToStr(t, "dd-mm-yy hh:mm:ss")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
// Output:
// 2021-01-02 16:04:08
// 2021-01-02
// 02-01-21 16:04:08
}
```
### <span id="FormatStrToTime">FormatStrToTime</span>
<p>Format string to time, `format` param specification see note 1.</p>
<b>Signature:</b>
```go
func FormatStrToTime(str, format string) (time.Time, error)
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
result1, _ := datetime.FormatStrToTime("2021-01-02 16:04:08", "yyyy-mm-dd hh:mm:ss")
result2, _ := datetime.FormatStrToTime("2021-01-02", "yyyy-mm-dd")
result3, _ := datetime.FormatStrToTime("02-01-21 16:04:08", "dd-mm-yy hh:mm:ss")
fmt.Println(result1)
fmt.Println(result2)
fmt.Println(result3)
// Output:
// 2021-01-02 16:04:08 +0000 UTC
// 2021-01-02 00:00:00 +0000 UTC
// 2021-01-02 16:04:08 +0000 UTC
}
```
### <span id="NewUnixNow">NewUnixNow</span>
<p>Return unix timestamp of current time</p>
<b>Signature:</b>
```go
type theTime struct {
unix int64
}
func NewUnixNow() *theTime
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm := datetime.NewUnixNow()
fmt.Println(tm)
// Output:
// &{1647597438}
}
```
### <span id="NewUnix">NewUnix</span>
<p>Return unix timestamp of specified int64 value.</p>
<b>Signature:</b>
```go
type theTime struct {
unix int64
}
func NewUnix(unix int64) *theTime
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm := datetime.NewUnix(1647597438)
fmt.Println(tm)
// Output:
// &{1647597438}
}
```
### <span id="NewFormat">NewFormat</span>
<p>Return unix timestamp of specified time string, t should be "yyyy-mm-dd hh:mm:ss".</p>
<b>Signature:</b>
```go
type theTime struct {
unix int64
}
func NewFormat(t string) (*theTime, error)
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm, err := datetime.NewFormat("2022-03-18 17:04:05")
fmt.Println(tm)
// Output:
// &{1647594245}
}
```
### <span id="NewISO8601">NewISO8601</span>
<p>Return unix timestamp of specified iso8601 time string.</p>
<b>Signature:</b>
```go
type theTime struct {
unix int64
}
func NewISO8601(iso8601 string) (*theTime, error)
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm, err := datetime.NewISO8601("2006-01-02T15:04:05.999Z")
fmt.Println(tm)
// Output:
// &{1136214245}
}
```
### <span id="ToUnix">ToUnix</span>
<p>Return unix timestamp.</p>
<b>Signature:</b>
```go
func (t *theTime) ToUnix() int64
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm := datetime.NewUnixNow()
fmt.Println(tm.ToUnix())
// Output:
// 1647597438
}
```
### <span id="ToFormat">ToFormat</span>
<p>Return time string 'yyyy-mm-dd hh:mm:ss'.</p>
<b>Signature:</b>
```go
func (t *theTime) ToFormat() string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm, _ := datetime.NewFormat("2022-03-18 17:04:05")
fmt.Println(tm.ToFormat())
// Output:
// 2022-03-18 17:04:05
}
```
### <span id="ToFormatForTpl">ToFormatForTpl</span>
<p>Return the time string which format is specified tpl.</p>
<b>Signature:</b>
```go
func (t *theTime) ToFormatForTpl(tpl string) string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm, _ := datetime.NewFormat("2022-03-18 17:04:05")
ts := tm.ToFormatForTpl("2006/01/02 15:04:05")
fmt.Println(ts)
// Output:
// 2022/03/18 17:04:05
}
```
### <span id="ToIso8601">ToIso8601</span>
<p>Return iso8601 time string.</p>
<b>Signature:</b>
```go
func (t *theTime) ToIso8601() string
```
<b>Example:</b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/datetime"
)
func main() {
tm, _ := datetime.NewISO8601("2006-01-02T15:04:05.999Z")
ts := tm.ToIso8601()
fmt.Println(ts)
// Output:
// 2006-01-02T23:04:05+08:00
}
```
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