Golang时间处理

1. 将日期转换为Unix时间戳

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// Time.Unix()
package main

import (
	"log"
	"time"
)

func main() {
	log.Println(time.Now().Unix())
}

2. 将Unix时间戳转换为日期时间

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package main

import (
	"log"
	"time"
)

func main() {
	timestamp := time.Now().Unix()
	t := time.Unix(timestamp, 0)
	log.Println(t)
}

3. 时间转字符串

使用Time.Format(layout)转字符串，其中layout可以是下面的选项：

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const (
        ANSIC       = "Mon Jan _2 15:04:05 2006"
        UnixDate    = "Mon Jan _2 15:04:05 MST 2006"
        RubyDate    = "Mon Jan 02 15:04:05 -0700 2006"
        RFC822      = "02 Jan 06 15:04 MST"
        RFC822Z     = "02 Jan 06 15:04 -0700" // RFC822 with numeric zone
        RFC850      = "Monday, 02-Jan-06 15:04:05 MST"
        RFC1123     = "Mon, 02 Jan 2006 15:04:05 MST"
        RFC1123Z    = "Mon, 02 Jan 2006 15:04:05 -0700" // RFC1123 with numeric zone
        RFC3339     = "2006-01-02T15:04:05Z07:00"
        RFC3339Nano = "2006-01-02T15:04:05.999999999Z07:00"
        Kitchen     = "3:04PM"
        // Handy time stamps.
        Stamp      = "Jan _2 15:04:05"
        StampMilli = "Jan _2 15:04:05.000"
        StampMicro = "Jan _2 15:04:05.000000"
        StampNano  = "Jan _2 15:04:05.000000000"
)

或是使用”2006-01-02 15:04:05”这样的layout string:

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time.Now().Format("2006-01-02 15:04:05")

这个时间是定死的，必须这么写，据说这个时间是Golang诞生的时间。

4. 字符串转时间

使用方法func Parse(layout, value string) (Time, error)来转换：

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package main

import (
	"log"
	"time"
)

func main() {
	t, err := time.Parse(time.UnixDate, "Sat Dec  1 17:55:41 CST 2018")
	if err != nil {
		log.Fatalln("time parse failed:", err.Error())
	}
	log.Println(t)
}

5. 时区转换

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package main

import (
	"log"
	"time"
)

func main() {
	now := time.Now()

	// CST时区
	cst, err := time.LoadLocation("Asia/Shanghai")
	if err != nil {
		log.Fatalln("time.LoadLocation error:", err.Error())
	}
	log.Println(now.In(cst))

	// UTC时区
	utc, err := time.LoadLocation("")
	if err != nil {
		log.Fatalln("time.LoadLocation error:", err.Error())
	}
	log.Println(now.In(utc))
}