如何将字符串转换为24小时格式的日期时间 [英] How do i convert string to datetime of 24 hr format

问题描述

我试图将字符串转换为24小时格式的日期时间。但以下代码总是返回12小时格式。



c＃

I tried to convert a string to datetime of 24 hour format. but the following code always return 12 hours format.

c#

queryStartDate = DateTime.ParseExact(dmqlDate.Substring(0, 19), "yyyy-MM-ddTHH:mm:ss", System.Globalization.CultureInfo.InvariantCulture);

请帮我解决这个问题。



谢谢，

Aravind



我尝试过：



queryStartDate = DateTime.ParseExact（dmqlDate.Substring（0,19），yyyy-MM-ddTHH：mm：ss，System.Globalization.CultureInfo.InvariantCulture）;

Please help me to solve this.

Thanks,
Aravind

What I have tried:

queryStartDate = DateTime.ParseExact(dmqlDate.Substring(0, 19), "yyyy-MM-ddTHH:mm:ss", System.Globalization.CultureInfo.InvariantCulture);

推荐答案

那是因为DateTime值没有任何格式：它们没有AM / PM或24小时的概念，因为它们自预定义的时间点以来被存储为多个刻度。

他们只有在将它们转换回字符串以便呈现给用户时才会获得格式，然后通常会以他喜欢的格式进行格式化。

That's because DateTime values don't have any formatting: they have no concept of "AM/PM" or "24 hour" becuase they are stored as a number of ticks since a predefined point in time.
They only acquire formatting when they are converted back to a string for presentation to the user, and would then normally be formatted in his prefered format.

日期是一个日期，仅此而已！



当您将字符串转换为DateTime时，您将获得DateTime，而不是24小时格式的字符串！

根据操作系统设置（区域设置），日期的字符串表示可能不一样。

请参阅：

标准日期和时间格式字符串 [ ^ ]

自定义日期和时间格式字符串 [ ^ ]



检查：

Date is a date and nothing more!

When you convert string into DateTime, you'll get DateTime, not a string in 24hrs format!
Depending on OS settings (locales), string representation of date may differ.
See:
Standard Date and Time Format Strings[^]
Custom Date and Time Format Strings[^]

Check this:

var dmqlDate = "2015-04-12T23:59:22;SomeStringAfterDate";
var queryStartDate = DateTime.ParseExact(dmqlDate.Substring(0, 19), "yyyy-MM-ddTHH:mm:ss", System.Globalization.CultureInfo.InvariantCulture);

Console.WriteLine(queryStartDate.ToString("f", System.Globalization.CultureInfo.CreateSpecificCulture("de-DE")));
Console.WriteLine(queryStartDate.ToString("F", System.Globalization.CultureInfo.CreateSpecificCulture("en-US")));
Console.WriteLine(queryStartDate.ToString("yyyy-MM-dd h:m:stt", System.Globalization.CultureInfo.CreateSpecificCulture("pl-PL")));

以上代码返回：

Above code returns:

Sonntag, 12. April 2015 23:59
Sunday, April 12, 2015 11:59:22 PM
2015-04-12 11:59:22

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