Haskell：将UTCTime转换为秒和毫秒 [英] Haskell : Convert UTCTime to seconds and milliseconds

问题描述

换句话说，我正在寻找相当于Python的 datetime.utcnow（）。

我也很好地使用包含年，月等等的n元组，​​直到毫秒（或我想过使用 show ，然后解析 String code> value，但我相信有更方便的东西。解析方法

重新解析一个字符串非常不合Haskellish ，你当然不想要。

我会用 Data.Time.LocalTime ，

  todSec。 localTimeOfDay。 utcToLocalTime utc 
  

可以以秒为单位分辨皮秒。

In other words, I'm looking for the equivalent of Python's datetime.utcnow().

I'm also fine with a n-tuple containing years, months and so on, up until milliseconds (or microseconds).

I had thought of using show and then parsing the String value, but I believe there's something more convenient.

解决方案

Re-parsing a string is very un-Haskellish, you certainly don't want that.

I'd use, from Data.Time.LocalTime,

todSec . localTimeOfDay . utcToLocalTime utc

that gives you seconds in picosecond-resolution.

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