If your beginning time is in A1, and ending time in A2, the formula is:
=a2-a1

Format as a time.

Regards,
Fred

"Chi" wrote in message
...
Hi

Please help me how to calculate the number of hours and minutes
Between two columns:

Ex:
Beginning Apt. Ending Apt.
2/1/10 9:40am and 2/1/10 2:00pm. It will be 4 hours and 20 minutes or
(4:20) if I calculate manually. Please help me to write the formula.

Thanks
Chi