how can we calculate the numbers of hours between two dates and

[Rama Chandra]

i need to calculate the exact number of hours between two different dates and
times, e.x. 04/12/10 10:23 AM and 04/15/10 15:18.

 

[Niek Otten]

=B1-A1, format Custom as [h]:mm

 

[Gary Brown]

=(+A2-A1)*24

 

[JLatham]

Subtract the earlier value from the later one and then use Format --> Custom
format:
[h]:mm:ss
For example with 04/12/10 10:23 AM in A1 and 04/15/10 15:18 in B1 then
=B1-A1
and with the custom formatting applied will display 76:55:00, which is 76
hours and 55 minutes.

 

[JLatham]

If you would rather have the result as a decimal number (76.91667 hours for
the previous example), then
=(B1-A1)*24
and format the cell as either General or one of the Number formats.