How to count days quantity [duplicate]

This question already has answers here: Calculate difference between two dates (number of days)? (17 answers) 开发者_高级运维 Closed 8 years ago.

I have check in year, month, day and check out year, moth, day. I can not solve problem how i can count how many days in this range

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var d1 = new DateTime(year1, month1, day1);
var d2 = new DateTime(year2, month2, day2);
TimeSpan t = d2 - d1;
var elapsedDays = t.Days;

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Try this:

TimeSpan difference = endTime.Subtract(startTime); 
int numDays = difference.Days;

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Subtracting a DateTime (or a DateTimeOffset) from another will result in a TimeSpan. The TimeSpan structure has a TotalDays property which should give you what you're looking for.

Here's a link to the MSDN page for TimeSpan.

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(new DateTime(endYear, endMonth, endDay) - new DateTime(startYear, startMonth, startDay)).TotalDays

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DateTime checkin //set to checkin date
DateTime checkout //set to checkout date
TimeSpan ts = checkout.Subtract(checkin);
int dayDifference = ts.TotalDays; //this is your days