How to get difference of dates

Question

I was wondering how I can get the difference between two dates in complete hours

e.g.

DateTime date1 = DateTime.Now;
DateTime date2 = new DateTime(2011, 8, 5, 33,00); 
long hours = date1 - date2;

Answer 1

It's the cast to long/int that will give you complete hours.

TimeSpan span = date1.Subtract(date2);
long hours = (long)span.TotalHours;

Answer 2

var hours = (date1 - date2).TotalHours;

Or, if you don't want the fraction of an hour:

var hours = Math.Floor((date1 - date2).TotalHours);