Go时间格式化/解析实例


Go支持通过基于模式的布局进行时间格式化和解析。这里是根据RFC3339格式化时间的一个基本示例,使用相应的布局常量。

时间解析使用Format相同的布局值。

具体的 epoch 用法,可参考示例中的代码 -

所有的示例代码,都放在 F:\worksp\golang 目录下。安装Go编程环境请参考:http://www.yiibai.com/go/go_environment.html

json.go的完整代码如下所示 -

package main

import "fmt"
import "time"

func main() {
    p := fmt.Println

    // Here's a basic example of formatting a time
    // according to RFC3339, using the corresponding layout
    // constant.
    t := time.Now()
    p(t.Format(time.RFC3339))

    // Time parsing uses the same layout values as `Format`.
    t1, e := time.Parse(
        time.RFC3339,
        "2012-11-01T22:08:41+00:00")
    p(t1)

    // `Format` and `Parse` use example-based layouts. Usually
    // you'll use a constant from `time` for these layouts, but
    // you can also supply custom layouts. Layouts must use the
    // reference time `Mon Jan 2 15:04:05 MST 2006` to show the
    // pattern with which to format/parse a given time/string.
    // The example time must be exactly as shown: the year 2006,
    // 15 for the hour, Monday for the day of the week, etc.
    p(t.Format("3:04PM"))
    p(t.Format("Mon Jan _2 15:04:05 2006"))
    p(t.Format("2006-01-02T15:04:05.999999-07:00"))
    form := "3 04 PM"
    t2, e := time.Parse(form, "8 41 PM")
    p(t2)

    // For purely numeric representations you can also
    // use standard string formatting with the extracted
    // components of the time value.
    fmt.Printf("%d-%02d-%02dT%02d:%02d:%02d-00:00\n",
        t.Year(), t.Month(), t.Day(),
        t.Hour(), t.Minute(), t.Second())

    // `Parse` will return an error on malformed input
    // explaining the parsing problem.
    ansic := "Mon Jan _2 15:04:05 2006"
    _, e = time.Parse(ansic, "8:41PM")
    p(e)
}

执行上面代码,将得到以下输出结果 -

F:\worksp\golang>go run time-formatting-parsing.go
2017-01-21T09:22:42+08:00
2012-11-01 22:08:41 +0000 +0000
9:22AM
Sat Jan 21 09:22:42 2017
2017-01-21T09:22:42.809652+08:00
0000-01-01 20:41:00 +0000 UTC
2017-01-21T09:22:42-00:00
parsing time "8:41PM" as "Mon Jan _2 15:04:05 2006": cannot parse "8:41PM" as "Mon"

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