I need help with a formula. I'm creating a spreadsheet where data entry
would indicate the time a patient arrives and than leaves. I need a formula
that calculates this, but displays nothing if no time is entered (for example
down the worksheet).

=IF((M2-L2)=0,""),IF((M2-L2)0,"h:mm")

This is what I have...I keep getting value error.

i want the time to display if the time is greater than zero, but if less
than zero, display nothing.

Thanks,

Cyrus