天两个日期之间的差额 [英] Days difference between two dates

问题描述

我一直想很多方法来计算两个日期之间的天数轮，我的意思是，计算整个天。什么，我需要一个例子：

I've been trying many ways to calculate the round number of days between two dates, I mean, counting the whole days. An example of what I need:

   START DATE            END DATE          Day Count  

24/02/2010 16:26     24/02/2010 16:26         1  
20/02/2010 18:16     24/02/2010 16:26         5  
31/12/2009 20:00     24/02/2010 16:26         56  
15/07/2009 20:59     24/02/2010 16:26         225  

推荐答案

日期时间的可减去得到一个时间跨度。的时间跨度具有TotalDays是天数（包括小数天以及）。

DateTime's can be subtracted to get a TimeSpan. The TimeSpan has a TotalDays which is the number of days (includes fractional days as well).

int DaysBetween(DateTime d1, DateTime d2) {
    TimeSpan span = d2.Subtract(d1);
    return (int)span.TotalDays;
}

注意的时间跨度签署。如果D1 = 1/9/11和D2 = 1/11/11，然后d1.subtract（D2）= -2天的时间跨度。所以，如果你想使用的时间跨度，以找出是否日期是在彼此的X天，你需要采取总天数的绝对值...

NOTE Time spans are signed. If d1=1/9/11 and d2=1/11/11, then d1.subtract(d2)=timespan of -2 days. So if you want to use a time span to find out if dates are within X days of each other, you need to take the absolute value of the total days...

Math.Abs(span.TotalDays)

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