C# 两个日期相减
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10871755/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Subtracting two dates
提问by sd_dracula
I have two calendars and each return a DateTime from calendar.SelectedDate.
我有两个日历，每个都从 calendar.SelectedDate 返回一个 DateTime。
How do I go about subtracting the two selected dates from each other, giving me the amount of days between the two selections?
我如何将两个选定的日期相减，得到两个选择之间的天数？
There is a calendar.Subtract() but it needs a TimeSpan instead of DateTime.
有一个 calendar.Subtract() 但它需要一个 TimeSpan 而不是 DateTime。
采纳答案by C.Evenhuis
You can use someDateTime.Subtract(otherDateTime), this returns a TimeSpanwhich has a TotalDaysproperty.
您可以使用someDateTime.Subtract(otherDateTime)，这将返回TimeSpan具有TotalDays属性的 。
回答by Jon Skeet
Just use:
只需使用：
TimeSpan difference = end - start;
double days = difference.TotalDays;
Note that if you want to treat them as datesyou should probably use
请注意，如果您想将它们视为日期，您可能应该使用
TimeSpan difference = end.Date - start.Date;
int days = (int) difference.TotalDays;
That way you won't get different results depending on the times.
这样你就不会根据时间得到不同的结果。
(You can use the Subtractmethod instead of the -operator if you want, but personally I find it clearer to use the operator.)
（如果需要，您可以使用该Subtract方法而不是-运算符，但我个人认为使用运算符更清晰。）
回答by Steve
Think about it.
How do you express a difference betwen two dates? With another date?
That's why you need the TimeSpan
想想看。
你如何表达两个日期之间的差异？和另一个约会？
这就是为什么你需要 TimeSpan
DateTime dtToday = new System.DateTime(2012, 6, 2, 0, 0, 0);
DateTime dtMonthBefore = new System.DateTime(2012, 5, 2, 0, 0, 0);
TimeSpan diffResult = dtToday.Subtract(dtMonthBefore);
Console.WriteLine(diffResult.TotalDays);
