使用DateTime.ParseExact只获取时间（不含当日）不含、当日、时间、DateTime
我得到意想不到的结果，当我使用DateTime.ParseExact。 下面是我的测试code：
I get unexpected results when I use DateTime.ParseExact. Here's my test code:
Dim MinVal As DateTime = #12:00:01 AM#
Dim MaxVal As DateTime = #11:59:59 PM#
Dim TooBig1, Equal1 As Boolean
Dim TooBig2, Equal2 As Boolean
Dim dt1 As DateTime = #12:00:01 AM#
Dim dt2 As DateTime = DateTime.ParseExact("12:00:01 AM", "hh:mm:ss tt", Globalization.DateTimeFormatInfo.InvariantInfo)
TooBig1 = (dt1.CompareTo(MaxVal) > 0)
Equal1 = (dt1.CompareTo(MinVal) = 0)
TooBig2 = (dt2.CompareTo(MaxVal) > 0)
Equal2 = (dt2.CompareTo(MinVal) = 0)
结果是罚款DT1：
The result is fine for dt1:
它显示了在调试器＃12：00：上午01点＃（不含当日） TooBig1为False Equal1为True但结果是（错？）出乎意料的DT2：
But the result is (wrong?) unexpected for dt2:
它显示了在调试器的第9 /二千零一十一分之三十○上午十二时零零分01秒＃ TooBig2为True Equal2为False看起来这是因为这一天是ParseExact系统的加入，即使我只指定格式的时间。
It looks like it's because the day is systematically added by ParseExact even though I only specify the time in the format.
我的问题是：我如何读取刚与DateTime.ParseExact时间
My question is: How can I read just the time with DateTime.ParseExact?
推荐答案
文档规定：
如果格式定义时间，没有日期元素和分析操作成功，得到的日期时间值有一个日期 DateTime.Now.Date 。
If format defines a time with no date element and the parse operation succeeds, the resulting DateTime value has a date of DateTime.Now.Date.
如果你想，没有日期的时间，你可以使用：
If you want a time with no date, you can use:
var parsedDate = DateTime.ParseExact(...);
var timeOnly = parsedDate - parsedDate.Date;
