日期時間

func main() {
	//1.獲取當前本地時間
	now := time.Now()
	fmt.Printf("now=%v,type=%T", now, now) //返回的類型是struct
	//2.通過now獲取各種詳細
	fmt.Printf("年=%v,type=%T\n", now.Year(), now.Year())
	fmt.Printf("月=%v,type=%T\n", now.Month(), now.Month())
	fmt.Printf("月=%v,type=%T\n", int(now.Month()), int(now.Month()))
	fmt.Printf("日=%v,type=%T\n", now.Day(), now.Day())
	fmt.Printf("時=%v,type=%T\n", now.Hour(), now.Hour())
	fmt.Printf("分=%v,type=%T\n", now.Minute(), now.Minute())
	fmt.Printf("秒=%v,type=%T\n", now.Second(), now.Second())
	fmt.Printf("星期=%v,type=%T\n", now.Weekday(), now.Weekday())
	fmt.Printf("星期=%v\n", int(now.Weekday()))
	//3.格式化日期時間
	dateStr := fmt.Sprintf("年月日時分=%d-%d-%d %d:%d\n", now.Year(), now.Month(),
		now.Day(), now.Minute(), now.Second())
	fmt.Println(dateStr)
	//4.蛋疼的指定格式
	fmt.Println(now.Format("2006-01-02 15:04:05"))
	fmt.Println(now.Format("2006-01-02"))
	fmt.Println(now.Format("06"))
	fmt.Println(now.Format("01"))
	fmt.Println(now.Format("03"))
	fmt.Println(now.Format("01-02-06 03 04 05"))
	//123456=月日時分秒年
	//5.時間常量&休眠
	//每隔固定時間打印數字，打到100退出
	for i := 0; i <= 100; i++ {
		fmt.Println(i)
		time.Sleep(time.Millisecond)
	}
	//6.獲取時間戳unix unixNano
	fmt.Println(now.Unix())
	fmt.Println(now.UnixNano())

	//跑之前的時間
	start := now.Unix()
	test()
	end := now.Unix()
	fmt.Printf("耗時%v", end-start)
}

//7.統計函數執行時間
func test() {
	str := ""
	for i := 0; i < 100000; i++ {
		str = str + "hello" + strconv.Itoa(i)
	}
}

上次修改於 2021-08-01