Dear Sir/madam

In my timesheet project when an user enters a from datetime Value and to datetime Value. How to make a check that in a period on which a user was working new project time entry doesnt clashes. He can enter any time not neccessary user has to enter in time sequence.

e.g from 12:20 to 14:30

so no other project starting time or ending time should be between the above
time.

please help.

thanks