Adding/Subtracting Time Help...

[killertofu]

I am trying to figure out how to subtract one time from the other to find out the number of hours/minutes passed between times.

For example
A B
1 09:00 11:30

I would like cell C1 to tell me 2.5 hours or 2:30 (whatever format it comes out). I will be listing a bunch of these times, so then at the end I would also like to SUM the C column and it give me the total hours spent. Kinda like a time log.

Thanks geniuses.

[daddylonglegs]

The simple answer is

=B1-A1

format as h:mm

If you may have time periods that start before midnight and end after, e.g. 21:00 to 06:00 then you could use

=B1-A1+(A1>B1)

again format as h:mm

[killertofu]

Ok, I tried that already, but when I went to SUM all the hours up, it gave me the wrong answer. I think it has to do with the fact that the differences that I come up with are not the hours difference, but a seperate time itself (ex. 8:00-10:00 is not 2:00 hours, but 02:00AM.)

Thanks for the help...sorry, I didn't mean to look like an idiot.

[killertofu]

It was how I had the SUM cell formatted, I didn't allow enough hour places, so like normal time, it was only giving me two digits.

Thanks for the help...