Go time包的简单知识

代码示例

package main

import (
	"fmt"
	"os"
	"time"
)

//time包练习




func main() {
	timeone := ""
	//当前时间
	now := time.Now()
	time1 := now.Format("2006-01-02 15:04:05")
	fmt.Println(time1)

//	年月日
	year := now.Year()
	month := now.Month()
	day := now.Day()
	hour := now.Hour()
	minute := now.Minute()
	second := now.Second()

	time2 := fmt.Sprintf("%d-%02d-%02d %02d:%02d:%02d",year,month,day,hour,minute,second)
	fmt.Println(time2)


	//当前时间的前一天
	yesterday := time.Now().Add(time.Hour*-24).Format("2006-01-02 15:04:05")
	fmt.Println(yesterday)

//	当前时间的第二天
	afterDay := time.Now().Add(time.Hour*24).Format("2006-01-02 15:04:05")
	fmt.Println(afterDay)
	//fmt.Println(len(os.Args),os.Args)
	if len(os.Args) == 1{
		timeone = yesterday
	}else{
		timeone = os.Args[1]
	}
	fmt.Println(timeone)

//	定时器
//	ticker := time.Tick(time.Second)
//	for i := range ticker{
//		fmt.Println(i.Format("2006-01-02 15:04:05"))
//	}

//	timer
	timer := time.NewTimer(time.Second*2)
	t1 := time.Now()
	t2 := <-timer.C
	fmt.Println(t1.Sub(t2))

	timer2 := time.NewTimer(time.Second*10)
	timer2.Reset(time.Second*4)
	t3 := time.Now()
	fmt.Println(t3)
	t4 := <-timer2.C
	timer2.Stop()
	fmt.Println(t4)

　　//  获取当前周几
　　weekMap := map[string]string{"Wednesday":"周三"}
　　//weekMap[]
　　t := time.Now()
　　fmt.Println(weekMap[t.Weekday().String()])

　　//判断t时间点是否在now的时间点之后
　　tafter := t.After(now)
　　fmt.Println(tafter) //true
　　//之前
　　tbefore := t.Before(now)
　　fmt.Println(tbefore)  //false

　　//解析字符串格式的时间
　　var strTime = "2021-10-11 14:20:43"
　　parseTime,_ := time.Parse("2006-01-02 15:04:05",strTime)
　　fmt.Println(parseTime.Format("2006-01-02 15:04:05"))
}