134 lines
5.0 KiB
Markdown
134 lines
5.0 KiB
Markdown
## Now
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Now is a time toolkit for golang
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[](https://goreportcard.com/report/github.com/jinzhu/now)
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[](https://github.com/jinzhu/now/actions)
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[](https://opensource.org/licenses/MIT)
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## Install
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```
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go get -u github.com/jinzhu/now
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```
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## Usage
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Calculating time based on current time
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```go
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import "github.com/jinzhu/now"
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time.Now() // 2013-11-18 17:51:49.123456789 Mon
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now.BeginningOfMinute() // 2013-11-18 17:51:00 Mon
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now.BeginningOfHour() // 2013-11-18 17:00:00 Mon
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now.BeginningOfDay() // 2013-11-18 00:00:00 Mon
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now.BeginningOfWeek() // 2013-11-17 00:00:00 Sun
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now.BeginningOfMonth() // 2013-11-01 00:00:00 Fri
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now.BeginningOfQuarter() // 2013-10-01 00:00:00 Tue
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now.BeginningOfYear() // 2013-01-01 00:00:00 Tue
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now.EndOfMinute() // 2013-11-18 17:51:59.999999999 Mon
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now.EndOfHour() // 2013-11-18 17:59:59.999999999 Mon
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now.EndOfDay() // 2013-11-18 23:59:59.999999999 Mon
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now.EndOfWeek() // 2013-11-23 23:59:59.999999999 Sat
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now.EndOfMonth() // 2013-11-30 23:59:59.999999999 Sat
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now.EndOfQuarter() // 2013-12-31 23:59:59.999999999 Tue
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now.EndOfYear() // 2013-12-31 23:59:59.999999999 Tue
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now.WeekStartDay = time.Monday // Set Monday as first day, default is Sunday
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now.EndOfWeek() // 2013-11-24 23:59:59.999999999 Sun
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```
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Calculating time based on another time
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```go
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t := time.Date(2013, 02, 18, 17, 51, 49, 123456789, time.Now().Location())
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now.With(t).EndOfMonth() // 2013-02-28 23:59:59.999999999 Thu
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```
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Calculating time based on configuration
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```go
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location, err := time.LoadLocation("Asia/Shanghai")
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myConfig := &now.Config{
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WeekStartDay: time.Monday,
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TimeLocation: location,
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TimeFormats: []string{"2006-01-02 15:04:05"},
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}
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t := time.Date(2013, 11, 18, 17, 51, 49, 123456789, time.Now().Location()) // // 2013-11-18 17:51:49.123456789 Mon
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myConfig.With(t).BeginningOfWeek() // 2013-11-18 00:00:00 Mon
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myConfig.Parse("2002-10-12 22:14:01") // 2002-10-12 22:14:01
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myConfig.Parse("2002-10-12 22:14") // returns error 'can't parse string as time: 2002-10-12 22:14'
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```
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### Monday/Sunday
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Don't be bothered with the `WeekStartDay` setting, you can use `Monday`, `Sunday`
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```go
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now.Monday() // 2013-11-18 00:00:00 Mon
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now.Sunday() // 2013-11-24 00:00:00 Sun (Next Sunday)
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now.EndOfSunday() // 2013-11-24 23:59:59.999999999 Sun (End of next Sunday)
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t := time.Date(2013, 11, 24, 17, 51, 49, 123456789, time.Now().Location()) // 2013-11-24 17:51:49.123456789 Sun
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now.With(t).Monday() // 2013-11-18 00:00:00 Sun (Last Monday if today is Sunday)
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now.With(t).Sunday() // 2013-11-24 00:00:00 Sun (Beginning Of Today if today is Sunday)
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now.With(t).EndOfSunday() // 2013-11-24 23:59:59.999999999 Sun (End of Today if today is Sunday)
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```
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### Parse String to Time
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```go
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time.Now() // 2013-11-18 17:51:49.123456789 Mon
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// Parse(string) (time.Time, error)
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t, err := now.Parse("2017") // 2017-01-01 00:00:00, nil
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t, err := now.Parse("2017-10") // 2017-10-01 00:00:00, nil
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t, err := now.Parse("2017-10-13") // 2017-10-13 00:00:00, nil
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t, err := now.Parse("1999-12-12 12") // 1999-12-12 12:00:00, nil
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t, err := now.Parse("1999-12-12 12:20") // 1999-12-12 12:20:00, nil
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t, err := now.Parse("1999-12-12 12:20:21") // 1999-12-12 12:20:21, nil
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t, err := now.Parse("10-13") // 2013-10-13 00:00:00, nil
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t, err := now.Parse("12:20") // 2013-11-18 12:20:00, nil
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t, err := now.Parse("12:20:13") // 2013-11-18 12:20:13, nil
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t, err := now.Parse("14") // 2013-11-18 14:00:00, nil
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t, err := now.Parse("99:99") // 2013-11-18 12:20:00, Can't parse string as time: 99:99
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// MustParse must parse string to time or it will panic
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now.MustParse("2013-01-13") // 2013-01-13 00:00:00
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now.MustParse("02-17") // 2013-02-17 00:00:00
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now.MustParse("2-17") // 2013-02-17 00:00:00
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now.MustParse("8") // 2013-11-18 08:00:00
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now.MustParse("2002-10-12 22:14") // 2002-10-12 22:14:00
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now.MustParse("99:99") // panic: Can't parse string as time: 99:99
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```
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Extend `now` to support more formats is quite easy, just update `now.TimeFormats` with other time layouts, e.g:
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```go
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now.TimeFormats = append(now.TimeFormats, "02 Jan 2006 15:04")
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```
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Please send me pull requests if you want a format to be supported officially
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## Contributing
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You can help to make the project better, check out [http://gorm.io/contribute.html](http://gorm.io/contribute.html) for things you can do.
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# Author
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**jinzhu**
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* <http://github.com/jinzhu>
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* <wosmvp@gmail.com>
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* <http://twitter.com/zhangjinzhu>
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## License
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Released under the [MIT License](http://www.opensource.org/licenses/MIT).
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