Go 语言的时间工具库。项目简单、代码易懂，示例代码丰富： ```go import "github.com/jinzhu/now" time.Now() // 2013-11-18 17:51:49.123456789 Mon now.BeginningOfMinute() // 2013-11-18 17:51:00 Mon now.BeginningOfHour() // 2013-11-18 17:00:00 Mon now.BeginningOfDay() // 2013-11-18 00:00:00 Mon now.BeginningOfWeek() // 2013-11-17 00:00:00 Sun now.BeginningOfMonth() // 2013-11-01 00:00:00 Fri now.BeginningOfQuarter() // 2013-10-01 00:00:00 Tue now.BeginningOfYear() // 2013-01-01 00:00:00 Tue now.WeekStartDay = time.Monday // Set Monday as first day, default is Sunday now.BeginningOfWeek() // 2013-11-18 00:00:00 Mon now.EndOfMinute() // 2013-11-18 17:51:59.999999999 Mon now.EndOfHour() // 2013-11-18 17:59:59.999999999 Mon now.EndOfDay() // 2013-11-18 23:59:59.999999999 Mon now.EndOfWeek() // 2013-11-23 23:59:59.999999999 Sat now.EndOfMonth() // 2013-11-30 23:59:59.999999999 Sat now.EndOfQuarter() // 2013-12-31 23:59:59.999999999 Tue now.EndOfYear() // 2013-12-31 23:59:59.999999999 Tue now.WeekStartDay = time.Monday // Set Monday as first day, default is Sunday now.EndOfWeek() // 2013-11-24 23:59:59.999999999 Sun ```