AM / PM到TimeSpan [英] AM/PM to TimeSpan

问题描述

我想实现这，即我要将格式为 hh：mm tt 的字符串转换为 TimeSpan ，秒为零。

I want to achieve the converse of this, that is, I want to convert a string with format hh:mm tt to a TimeSpan with zeroed seconds.

例如，转换 09:45 pm 到 21:45:00 。

推荐答案

最简单的方法可能是是使用 DateTime.ParseExact 将其解析为 DateTime ，然后使用 TimeOfDay 精确到 TimeSpan 。

The simplest approach would probably be to parse it as a DateTime using DateTime.ParseExact, and then use the TimeOfDay to exact the TimeSpan.

DateTime dateTime = DateTime.ParseExact(text,
                                    "hh:mm tt", CultureInfo.InvariantCulture);
TimeSpan span = dateTime.TimeOfDay;

奇怪的是，当您还 / em>但指定一个am / pm指示符。您可能希望格式字符串中用 h代替 hh，以允许用 9:45 pm代替 09:45 pm。

It's odd to see a leading 0 on a number of hours when you're also specifying an am/pm designator though. You might want "h" instead of "hh" in the format string, to allow "9:45 pm" instead of "09:45 pm".

（I还会说起初这是 TimeSpan 的奇怪用法，但是在我看来，.NET日期/时间类型有些混乱。使用 Noda时间，但我有偏见：）

(I'd also argue that it's a strange use of TimeSpan in the first place, but then the .NET date/time types are somewhat messed up in my view. I'd recommend using Noda Time, but I'm biased :)

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