How to count hours when time goes over 00:00 ?

[zeze]

How to count time when it goes over the midniht ?

 

For example lets say start time is 15:00 and end time is 01:00 then how to calculate time between there.

I know one way is to add date to these times but is there a way around it ?

I don't want to add 2 extra fields and force user to select dates.

[Jessica]

Without a date, how do you know if its 1 am the next day or 1 am three days later?

[Barand]

if second time less than first time then add 24 hours before subtracting

[zeze]

Barand solved it!

Thanks !