Detailed explanation of time package based on Go language
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) }
Execution results
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) }
执行结果
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) }
执行结果
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) }
执行效果
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) }
执行结果
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) }
执行结果
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) }
执行结果
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) } }
执行结果
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")) }
执行结果
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) }
执行结果
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.
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