time的常用方法说明

time应该是开发中比较常用的库了,常见方法说明:

package main
import (
 "time"
 "fmt"
)
func main() {
 a := time.Now().Unix()
 fmt.Println("时间戳---", a)
 // 2006年01月02日 15:04:05 记住这一刻
 b := time.Now().Format("2006-01-02 15:04:05")
 fmt.Println("格式化时间", b)
 /**
 func (t Time) Add(d Duration) Time
 Duration如下
 const (
 Nanosecond Duration = 1
 Microsecond = 1000 * Nanosecond
 Millisecond = 1000 * Microsecond
 Second = 1000 * Millisecond
 Minute = 60 * Second
 Hour = 60 * Minute
 )
 */
 c := time.Now().Add(time.Minute * 3)
 fmt.Println("3分钟后时间", c.Format("2006-01-02 15:04:05"))
 /**
 func (t Time) AddDate(years int, months int, days int) Time
 */
 d := time.Now().AddDate(-1, 1,10)
 fmt.Println("时间", d.Format("2006-01-02 15:04:05"))
 // 返回年月日三个值
 fmt.Println(time.Now().Date())
 // 返回时分秒三个值
 fmt.Println(time.Now().Clock())
 fmt.Println(time.Now().Year(), time.Now().Month(), time.Now().Day())
 fmt.Println(time.Now().Weekday(), time.Now().Hour())
 fmt.Println(time.Now().YearDay())
 fmt.Println(time.Since(d))
 // tring返回采用如下格式字符串的格式化时间。
 // "2006-01-02 15:04:05.999999999 -0700 MST"
 fmt.Println(time.Now().String())
 time.AfterFunc(2*time.Second, func() {
 fmt.Println("hello 2s")
 })
 loc, _ := time.LoadLocation("Asia/Shanghai")
 const longForm = "Jan 2, 2006 at 3:04pm (MST)"
 const shortForm = "2006-Jan-02"
 t, _ := time.ParseInLocation(longForm, "Jul 9, 2012 at 5:02am (CEST)", loc)
 fmt.Println(t)
 /**
 func ParseInLocation(layout, value string, loc *Location) (Time, error)
 */
 t, _ = time.ParseInLocation(shortForm, "2022-Jul-09", loc)
 fmt.Println(t)
 /**
 func Parse(layout, value string) (Time, error)
 解析一个格式化的时间字符串并返回它代表的时间
 ParseInLocation类似Parse但有两个重要的不同之处。
 第一,当缺少时区信息时,Parse将时间解释为UTC时间,而ParseInLocation将返回值的Location设置为loc;
 第二,当时间字符串提供了时区偏移量信息时,Parse会尝试去匹配本地时区,而ParseInLocation会去匹配loc
 */
 t, _ = time.Parse(longForm, "Feb 3, 2023 at 7:54pm (PST)")
 fmt.Println(t)
 t, _ = time.Parse(shortForm, "2020-Feb-03")
 fmt.Println(t)
 ch := make(chan int)
 timeout := time.After(time.Second * 2)
 timer := time.NewTimer(time.Second * 4) 
 var i int
 go func() {
 for {
 // i++
 select {
 case <- ch:
 fmt.Println("channel close")
 return
 case <- timer.C:
 fmt.Println("4s的NewTimer定时任务")
 case <- timeout:
 fmt.Println("4s定时输出")
 case <- time.After(time.Second * 6):
 fmt.Println("6s到了") 
 // default:
 // //Sleep 1秒,参数就是上面的Duration
 // time.Sleep(time.Second * 1)
 // fmt.Println("go 1s")
 }
 }
 }()
 time.Sleep(time.Second * 15)
 fmt.Println("close----")
 close(ch)
 time.Sleep(time.Second * 2)
}

• 编辑
• 预览