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