Go语言中DateTime知识点

一、基本使用

①从属于time这个包

②一般使用都是使用

time.Time 这个类型表示时间，time包中还有一些常量，源码如下

// Common durations. There is no definition for units of Day or larger
// to avoid confusion across daylight savings time zone transitions.
//
// To count the number of units in a Duration, divide:
//	second := time.Second
//	fmt.Print(int64(second/time.Millisecond)) // prints 1000
//
// To convert an integer number of units to a Duration, multiply:
//	seconds := 10
//	fmt.Print(time.Duration(seconds)*time.Second) // prints 10s
//

const (
	Nanosecond  Duration = 1
	Microsecond          = 1000 * Nanosecond
	Millisecond          = 1000 * Microsecond
	Second               = 1000 * Millisecond
	Minute               = 60 * Second
	Hour                 = 60 * Minute
)

③ time.Now() 获取当前的时间，返回的是Time类型

Time类型中的

　　Year() 获取当前的年份

　　Month() 获取当前的月份

　　Day() 获取当前的日期

　　Hour() 获取当前小时

　　Minute() 获取当前分钟

　　Second() 获取当前秒

④常用 Unix() 方法获取时间戳信息

⑤通过AddDate()方法增加指定日期，Add方法增加指定时间

举个例子：

①打印时间基础信息

func DateTimeBasic() time.Time{
	now:=time.Now()

	fmt.Printf("%v\n",now)

	year:=now.Year()
	month:=now.Month()
	day:=now.Day()
	hour:=now.Hour()
	minute:=now.Minute()
	send:=now.Second()

	fmt.Printf("%02d/%02d/%02d %02d:%02d:%02d\n",year,month,day,hour,minute,send)

	return now
}

② 时间和时间戳直接的转换第一个函数输入时间返回时间戳，第二个函数输入时间戳返回时间

func GetDateTimeStamp(datetime time.Time) int64{
	now:=datetime.Unix()
	fmt.Printf("TimeStamp: %v\n",now)
	return now
}

func GetDateTime(timeStamp int64){
	now:=time.Unix(timeStamp,0)
	fmt.Printf("DateTime: %v\n",now)
}

③增加时间

func AddDay(src time.Time) time.Time{
    //添加一天两小时
    src = src.AddDate(0,0,1).Add(time.Hour * 2)
    return src
}

④测试一下

package main

import "DateTimeDemo"

func main(){
	
	dateTime:=DateTimeDemo.DateTimeBasic()
	calcDateTime := DateTimeDemo.AddDay(dateTime)
	timeStamp:=DateTimeDemo.GetDateTimeStamp(calcDateTime)
	DateTimeDemo.GetDateTime(timeStamp)
	
}

⑤输出

2019-02-26 16:51:59.7509972 +0800 CST m=+0.010553801
2019/02/26 16:51:59
TimeStamp: 1551264719
DateTime: 2019-02-27 18:51:59 +0800 CST

二、简单定时器

利用time中Tick()方法

func SimpleTicker(){
   //间隔两秒，会像Channel中写入一个数据
   ticker := time.Tick(time.Second * 2)

   for i := range ticker{
      fmt.Printf("%v\n",i)
      simpleTask()
   }
}

func simpleTask(){
   fmt.Println("Task Start")
}

执行结果：

2019-02-26 16:54:43.7828451 +0800 CST m=+2.077803401
Task Start
2019-02-26 16:54:45.7831559 +0800 CST m=+4.078114201
Task Start
2019-02-26 16:54:47.7831744 +0800 CST m=+6.078132701
Task Start
2019-02-26 16:54:49.7833155 +0800 CST m=+8.078273801
Task Start
2019-02-26 16:54:51.782682 +0800 CST m=+10.077640301
Task Start

Go语言中DateTime知识点

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