1 获取当前时间

package main
import (
    "fmt"
    "reflect"
    "time"
)
func main() {
    // 2022-01-23 11:55:39.365838 +0800 CST m=+0.000077818 time.Time
    fmt.Println(time.Now(), reflect.TypeOf(time.Now()))
    // 1642910139 int64
    fmt.Println(time.Now().Unix(), reflect.TypeOf(time.Now().Unix()))
    // 获取间隔时间
    start := time.Now()
    time.Sleep(time.Second * 2)
    // 2.001484829s time.Duration
    fmt.Println(time.Since(start), reflect.TypeOf(time.Since(start)))
}

2 定时器

(1) Timer

package main
import (
    "fmt"
    "time"
)
func main() {
    // 1.timer基本使用
    //timer1 := time.NewTimer(2 * time.Second)
    //t1 := time.Now()
    //fmt.Printf("t1:%v\n", t1)
    //t2 := <-timer1.C
    //fmt.Printf("t2:%v\n", t2)
    // 2.验证timer只能响应1次
    //timer2 := time.NewTimer(time.Second)
    //for {
    // <-timer2.C
    // fmt.Println("时间到")
    //}
    // 3.timer实现延时的功能
    //(1)
    //time.Sleep(time.Second)
    //(2)
    //timer3 := time.NewTimer(2 * time.Second)
    //<-timer3.C
    //fmt.Println("2秒到")
    //(3)
    //<-time.After(2*time.Second)
    //fmt.Println("2秒到")
    // 4.停止定时器
    //timer4 := time.NewTimer(2 * time.Second)
    //go func() {
    // <-timer4.C
    // fmt.Println("定时器执行了")
    //}()
    //b := timer4.Stop()
    //if b {
    // fmt.Println("timer4已经关闭")
    //}
    // 5.重置定时器
    timer5 := time.NewTimer(3 * time.Second)
    timer5.Reset(1 * time.Second)
    fmt.Println(time.Now())
    fmt.Println(<-timer5.C)
    for {
    }
}

(2) Ticker

时间到了，多次执行

package main
import (
    "fmt"
    "time"
)
func main() {
    // 1.获取ticker对象
    ticker := time.NewTicker(1 * time.Second)
    i := 0
    // 子协程
    go func() {
        for {
            i++
            fmt.Println(<-ticker.C)
            if i == 5 {
                //停止
                ticker.Stop()
            }
        }
    }()
    for {
    }
}