C# 仅基于日期的日期时间差（以天为单位）
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DateTime difference in days on the basis of Date only
提问by StartingFromScratch
I need to find the difference in days between two dates.
我需要找到两个日期之间的天数差异。
For example:
例如：
Input: **startDate** = 12-31-2012 23hr:59mn:00sec, **endDate** = 01-01-2013 00hr:15mn:00sec
输入： **startDate** = 12-31-2012 23hr:59mn:00sec, **endDate** = 01-01-2013 00hr:15mn:00sec
Expected output: 1
预期输出： 1
I tried the following:
我尝试了以下方法：
(dt1-dt2).TotalDaysand convert to integer but didn't give me appropriate answer as double has to be converted to int - tried Math.Ceiling, Convert.To...dt1.day - dt2.daydoes not work across monthsdt.Substract()has the same output as option 1 mentioned above.
(dt1-dt2).TotalDays并转换为整数，但没有给我适当的答案，因为 double 必须转换为 int - 尝试过 Math.Ceiling、Convert.To ...dt1.day - dt2.day跨月不起作用dt.Substract()具有与上述选项 1 相同的输出。
None of the above worked, so I ended up writing the following code. The code works well, but I feel that there must be a solution with only a couple of lines of code.
以上都没有奏效，所以我最终编写了以下代码。代码运行良好，但我觉得必须有一个只有几行代码的解决方案。
public static int GetDifferenceInDaysX(this DateTime startDate, DateTime endDate)
{
//Initializing with 0 as default return value
int difference = 0;
//If either of the dates are not set then return 0 instead of throwing an exception
if (startDate == default(DateTime) | endDate == default(DateTime))
return difference;
//If the dates are same then return 0
if (startDate.ToShortDateString() == endDate.ToShortDateString())
return difference;
//startDate moving towards endDate either with increment or decrement
while (startDate.AddDays(difference).ToShortDateString() != endDate.ToShortDateString())
{
difference = (startDate < endDate) ? ++difference : --difference;
}
return difference;
}
Note: I do not have any performance issue in the while-loop iteration as the max difference will not be more than 30 to 45 days.
注意：我在 while 循环迭代中没有任何性能问题，因为最大差异不会超过 30 到 45 天。
采纳答案by Damien_The_Unbeliever
回答by Habib
Use TimeStamp. Just subtract two dates (using DateTime.Dateproperty), get the difference in time span and return TotalDays
使用时间戳。只需减去两个日期（使用DateTime.Date属性），得到时间跨度的差异并返回TotalDays
TimeSpan ts = endDate.Date - startDate.Date;
double TotalDays = ts.TotalDays;
So your extension method can be as simple as:
所以你的扩展方法可以很简单：
public static int GetDifferenceInDaysX(this DateTime startDate, DateTime endDate)
{
return (int) (endDate.Date - startDate.Date).TotalDays;
// to return just a int part of the Total days, you may round it according to your requirement
}
EDIT:Since the question has been edited, you may check the following example. Consider the following two dates.
编辑：由于问题已被编辑，您可以查看以下示例。考虑以下两个日期。
DateTime startDate = new DateTime(2012, 12, 31, 23, 59, 00);
DateTime endDate = new DateTime(2013, 01, 01, 00, 15, 00);
You can write the extension method as:
您可以将扩展方法编写为：
public static int GetDifferenceInDaysX(this DateTime startDate, DateTime endDate)
{
TimeSpan ts = endDate - startDate;
int totalDays = (int) Math.Ceiling(ts.TotalDays);
if (ts.TotalDays < 1 && ts.TotalDays > 0)
totalDays = 1;
else
totalDays = (int) (ts.TotalDays);
return totalDays;
}
For the above dates it will give you 1
对于上述日期，它会给你 1
回答by Amiram Korach
If you use the DateTime.Dateproperty this will eliminate the time
如果您使用该DateTime.Date属性，这将消除时间
date1.Date.Subtract(date2.Date).Days
