如何解析时间长度不同的字符串时间戳？

问题描述：

I have a slice of values holding timestamps of different length. Most of them look like this:

2006-01-02T15:04:05.000000Z

but some of them are shorter:

2006-01-02T15:04:05.00000Z
2006-01-02T15:04:05.0000Z

If I do:

str := dataSlice[j][0].(string)
layout := "2006-01-02T15:04:05.000000Z"
t, err := time.Parse(layout, str)

I get errors like:

parsing time "2016-10-23T02:38:45.25986Z" as "2006-01-02T15:04:05.000000Z": cannot parse "" as ".000000"
parsing time "2016-10-23T21:43:59.0175Z" as "2006-01-02T15:04:05.000000Z": cannot parse ".0175Z" as ".000000"

I want to parse them exactly like they originally are. How can I dynamically switch the layout corresponding to the length? (And why do the error messages differ?)

我有一小部分值保存着不同长度的时间戳。其中大多数看起来像这样： p>

  2006-01-02T15：04：05.000000Z 
  code>  pre> 
 
 ，但其中一些较短： p> 
  
 
  2006-01-02T15：04：05.00000Z 
2006-01-02T15：04：05.0000Z 
  code>  pre> 
 
 如果我这样做：   p> 
 
 
  str：= dataSlice [j] [0]。（string）
layout：=“ 2006-01-02T15：04：05.000000Z” 
t，err：=  time.Parse（layout，str）
  code>  pre> 
 
 我收到类似以下错误： p> 
 
 
 解析时间“ 2016-10  -23T02：38：45.25986Z“设为” 2006-01-02T15：04：05.000000Z“：无法将”“解析为” .000000“ 
解析时间” 2016-10-23T21：43：59.0175Z“设为” 2006-  01-02T15：04：05.000000Z“：无法将” .0175Z“解析为” .000000“ 
  code>  pre> 
 
 我想像它们原本一样解析它们。\  n我如何动态地切换与长度相对应的布局？
（为什么错误消息会有所不同？） p> 
  div>

答

For time layouts, if the fractional seconds are optional, use 9 instead of 0 in the layout. For example, 2006-01-02T15:04:05.00000Z matches only times with 5 digits after the decimal place. However, 2006-01-02T15:04:05.9Z matches a time with any number of digits after the decimal, including zero.

https://play.golang.org/p/QMD28aqv9E

The Time.Format documentation provides examples, the last one of which explains this behavior.

答

Just replace 000000 with 999999:

layout := "2006-01-02T15:04:05.999999Z"

Playground: https://play.golang.org/p/Wd7kXIpoWO.

如何解析时间长度不同的字符串时间戳？

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