Detailed explanation of time package based on Go language-Golang-php.cn

Detailed explanation of time package based on Go language

Go语言进阶学习

Release： 2023-07-21 13:27:11

forward

1264 people have browsed it

##time.Now()

time.Now() returns a Time type.

The relevant codes are as follows

func main() {
    var nowTime = time.Now()
    fmt.Println(nowTime)
    var year = nowTime.Year()     //当前年份
    var month = nowTime.Month()   //当前月份
    var day = nowTime.Day()       //今天几号
    var hour = nowTime.Hour()     //现在几时
    var Minute = nowTime.Minute() //现在几分
    var second = nowTime.Second() //现在几秒
    fmt.Printf("当前年份:%v\n"，year)
    fmt.Printf("当前月份:%v\n"，month)
    fmt.Printf("几号了:%v\n"，day)
    fmt.Printf("几时:%v\n"，hour)
    fmt.Printf("几分:%v\n"，Minute)
    fmt.Printf("几秒:%v\n"，second)
}

Copy after login

Execution results

Detailed explanation of time package based on Go language

时间戳

时间戳:从北京时间1970年1月1日8点到现在时间的秒数，是一个int64类型。

相关代码

func main() {
    var nowTime = time.Now()
    var timestampSecond = nowTime.Unix()
    fmt.Println(timestampSecond)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

到目前为止已经有1603698727秒了，时间不等人呐！

纳秒时间戳

一般情况下我们使用的都是秒，但是时间戳还可以返回成纳秒，用的不多，了解就好。

代码

func main() {
    var nowTime = time.Now()
    var timestampNano = nowTime.UnixNano()
    fmt.Println(timestampNano)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

时间戳转Time

有时候别人给我们的是时间戳，我们需要反着转以下，时间戳->时间类型。

需要用到的是time.Unix。

代码

func main() {
    //时间戳
    var timestampSecond int64 = 1603698727
    //转换为time对象
    var timeObj = time.Unix(timestampSecond， 0)
    var year = timeObj.Year()     //当前年份
    var month = timeObj.Month()   //当前月份
    var day = timeObj.Day()       //今天几号
    var hour = timeObj.Hour()     //现在几时
    var Minute = timeObj.Minute() //现在几分
    var second = timeObj.Second() //现在几秒
    fmt.Printf("年份:%v\n"， year)
    fmt.Printf("月份:%v\n"， month)
    fmt.Printf("几号:%v\n"， day)
    fmt.Printf("几时:%v\n"， hour)
    fmt.Printf("几分:%v\n"， Minute)
    fmt.Printf("几秒:%v\n"， second)
}

Copy after login

执行效果

Detailed explanation of time package based on Go language

Time

Many times, when we get a time, we need to calculate forward or backward a month, or a few hours, this is time.

In Go, there are two functions for time estimation, one is Add and the other is AddDate, respectively hours and days.

Add

Code

Add最大单位是小时，只能+小时

func main() {
    //当前时间
    nowTime := time.Now()
    fmt.Println("当前时间:"，nowTime)
    time1 := nowTime.Add(time.Hour)
    fmt.Println("加一个小时时间:"， time1)
    time2 := nowTime.Add( time.Hour*2)
    fmt.Println("加二个小时时间:"， time2)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

AddDate

AddDate就牛逼很多了，有三个参数，分别是年，月，日，根据需求加就行了。

代码

func main() {
    //当前时间
    nowTime := time.Now()
    fmt.Println("当前时间:"，nowTime)
    month1 := nowTime.AddDate(0， 1， 1)
    fmt.Println("加一个月时间:"， month1)
    month2 := nowTime.AddDate(0， 2， 1)
    fmt.Println("加二个月时间:"， month2)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

注意:上述不仅可以时间+，还可以时间-，前面加负号就可以了。

Sub

Sub通常用在计算某一段代码执行用了多久时间，最后时间-最开始时间=执行时间。

代码

func main() {
    //当前时间
    beginTime := time.Now()
    //各种操作
    time.Sleep(time.Second)
    //结束时间
    end_time := time.Now()
    //计算时间
    execTime := end_time.Sub(beginTime)
    fmt.Println("执行时间:"， execTime)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

定时器

默认的定时器挺Low的，只有最简单的功能，了解就好。

示例:每隔一秒执行次相关代码。

代码

func main() {
    ticker := time.Tick(time.Second)
    for i := range ticker {
        fmt.Println(i)
}
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

时间格式化(time -> string)

Go语言的时间格式化，有点逗，跟其他语言都不一样，没有%Y，%M之类的写法。

记住一个时间2006-01-02 15:04:05.000 Mon Jan/PM Mon Jan。

分别对应年-月-日时:分:秒 24/12。

当前，同其语言一样，可以只格式化年-月-日等。

格式时间需要用到Format方法。

代码

func main() {
    now := time.Now()
    //年 月 日 时 分 秒
    fmt.Println(now.Format("2006-01-02 15:04:05"))
    //24小时
    fmt.Println(now.Format("2006-01-02 15:04:05 Mon Jan"))
    //12小时
    fmt.Println(now.Format("2006-01-02 15:04:05 PM Mon Jan"))
    //年月日
    fmt.Println(now.Format("2006-01-02"))
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

字符串格式化时间(string -> time)

将拿到的时间字符串转成时间类型。

代码

func main() {
    //时间字符串
    timeString := "2020/09/01 14:01:45"
    //加载时区，亚洲/上海
    location， err := time.LoadLocation("Asia/Shanghai")
    if err != nil {
        fmt.Println("时区加载失败，"， err)
        return
}
    timeObj， err := time.ParseInLocation("2006/01/02 15:04:05"， timeString， location)
    if err != nil {
        fmt.Println("时间转换失败，"， err)
        return
}
    fmt.Println(timeObj)
}

Copy after login

执行结果

Detailed explanation of time package based on Go language

Summary

This is finally over. The operations on Go time are basically as mentioned above.

Of course, this is a package that comes with so many functions, which is basically enough for daily use.

In fact, the main important ones are Add and AddDate ,Time-> Format String,String-> Time, these are the most frequently used in daily life.

The above is the detailed content of Detailed explanation of time package based on Go language. For more information, please follow other related articles on the PHP Chinese website!