DateTime difference

Question

How can I calculate the difference between 2 DateTimes?

DateTime a = DateTime.Now;
DateTime b = DateTime.Now.AddHours(1);
int differenceInMilliseconds;

Did you actually read the [documentation](http://msdn.microsoft.com/en-us/library/03ybds8y.aspx)? — Jon, Nov 01 '12 at 14:54
[See MSDN](http://msdn.microsoft.com/en-us/library/aa326709(v=vs.71).aspx) — SwDevMan81, Nov 01 '12 at 14:54
Duplicate of: http://stackoverflow.com/questions/1487146/convert-difference-between-2-times-into-milliseconds — JoshVarty, Nov 01 '12 at 14:54

score 3 · Accepted Answer · edited May 15 '13 at 13:31

3

The minus is overloaded, use the TimeSpan:

double differenceInMilliseconds = (b - a).TotalMilliseconds;

edited May 15 '13 at 13:31

Baby Groot

answered Nov 01 '12 at 14:55

Tim Schmelter

score 2 · Answer 2 · answered Nov 01 '12 at 14:57

DateTime values can be subtracted from one another resulting in an instance of a TimeSpan.

So

DateTime a = DateTime.Now;
DateTime b = a.AddHours(1);

TimeSpan difference = b - a;
double differenceInMilliseconds = difference.TotalMilliseconds;

Note that TotalMilliseconds is a double, not an int

score 0 · Answer 3 · edited May 15 '13 at 13:31

0

Hope this helps...

edited May 15 '13 at 13:31

Baby Groot

answered Nov 01 '12 at 14:55

fabricio

3 Answers3