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;

score 5 · Accepted Answer · answered Aug 30 '12 at 14:51

5

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

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

answered Aug 30 '12 at 14:51

saj

score 4 · Answer 2 · answered Aug 30 '12 at 14:51

4

var hours = (date1 - date2).TotalHours;

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

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

answered Aug 30 '12 at 14:51

Justin Niessner

@saj - What do you consider "complete hours" then? And, by the way, the result of this statement is the exact same as yours (date subtraction in this form results in a TimeSpan as well). – Justin Niessner Aug 30 '12 at 14:52
A full 60 mins, total hours returns a double I would expect no decimals – saj Aug 30 '12 at 14:53

Tim Schmelter · Answer 3 · 2012-08-30T14:59:20.067

3

You can use the TimeSpan by subtracting both dates:

DateTime date1 = DateTime.Now;
DateTime date2 = new DateTime(2011, 8, 5); 
TimeSpan ts = date1 - date2;
long hours = (long)ts.TotalHours;

If you want to round it as accurate as possible, you can use Math.Round:

long hours = (long)Math.Round(ts.TotalHours, MidpointRounding.AwayFromZero);

edited Aug 30 '12 at 14:59

answered Aug 30 '12 at 14:51

Tim Schmelter

score 1 · Answer 4 · answered Aug 30 '12 at 14:52

1

You can try with

  var result = date1 - date2;
    var hours = result .TotalHours;

answered Aug 30 '12 at 14:52

Aghilas Yakoub

score 1 · Answer 5 · edited May 23 '17 at 10:24

1

I've found a very nice DateTimeSpan implementation that I use to calculate various differences, hours, days, months in this post

edited May 23 '17 at 10:24

Community

answered Aug 30 '12 at 14:53

Marty

5 Answers5