I want be two dates diffrence code in javascrip and c#.

For C# you could just subtract the days or use the subtract method
eg
DateTime dt1 = ... some date value
DateTime dt2 = ... another date value

TimeSpan ts = dt1 - dt2;

or

TimeSpan ts = dt1.Subtract(dt2);

then use Days to get the number of days
eg

int daysDiff = ts.Days;

For Javascript, I haven't tried it but you could maybe try the examples given here http://www.dotnetspider.com/forum/213986...