Epoch {.en}

时代 {.zh}

::: {.en} A common requirement in programs is getting the number of seconds, milliseconds, or nanoseconds since the Unix epoch. Here’s how to do it in Go. :::

::: {.zh}

程序中的一个常见要求是获取自[Unix纪元]（http://en.wikipedia.org/wiki/Unix_time）以来的秒数，毫秒数或纳秒数。这是如何在Go中完成的。

:::

package main
import "fmt"
import "time"
func main() {

::: {.en} Use time.Now with Unix or UnixNano to get elapsed time since the Unix epoch in seconds or nanoseconds, respectively. :::

::: {.zh}

使用Unix或UnixNano的’time.Now`分别来自Unix纪元以来的getelapsed时间，分别为秒或纳秒。

:::

    now := time.Now()
    secs := now.Unix()
    nanos := now.UnixNano()
    fmt.Println(now)

::: {.en} Note that there is no UnixMillis, so to get the milliseconds since epoch you’ll need to manually divide from nanoseconds. :::

::: {.zh}

请注意，没有UnixMillis，所以要从epoch获得它们，你需要手动从纳秒开始。

:::

    millis := nanos / 1000000
    fmt.Println(secs)
    fmt.Println(millis)
    fmt.Println(nanos)

::: {.en} You can also convert integer seconds or nanoseconds since the epoch into the corresponding time. :::

::: {.zh}

您也可以将整数秒或纳秒从历元转换为相应的“时间”。

:::

    fmt.Println(time.Unix(secs, 0))
    fmt.Println(time.Unix(0, nanos))
}

$ go run epoch.go 
2012-10-31 16:13:58.292387 +0000 UTC
1351700038
1351700038292
1351700038292387000
2012-10-31 16:13:58 +0000 UTC
2012-10-31 16:13:58.292387 +0000 UTC

::: {.en} Next we’ll look at another time-related task: time parsing and formatting. :::

::: {.zh}

接下来我们将看另一个与时间相关的任务：timeparsing和format。

:::