I'm working on an application used for booking Transport cabs, since we work in shifts; employees use the transport facility as per the shift schedule. The shift schedule as well as the transport schedule is prepared for a fortnight. To manage the transport system efficiently we have a policy that user should not select a time slot within 12 hour window for pickup and should not pick a drop slot with in 1 hour window. I have created a form to program the slots like 7:00, 11:30, 15:45, and 17:45 etc. User has option to select the predefined slots from the master form. Im using @dbcolumn formula to select the slots from a view.
Now what I want to program is when user tries to change the pickup slot lets say around 7:00 in the morning, he should only see the slots available on or after 19:00 similarly if it he tries to change the drop slot at 7:00 he should able to select any slot after 8:00. Pls help in developing this functionality.