123 time slot ✓ Partion 20 min slot of time in php from start and end time

Appl Form No Time Slot for Interview A123-00004 AM to 10 AM A123-00009 AM to 10 AM A123-00026 AM to 10 AM A123-00035 123 time slot,It is the lack of a time slot reallocation algorithm that can modify time slot assignments on selected platforms without Discrete Applied Mathematics 123, 257

I want to check that how many 20 min slot possible from start and end time => it will also check if some time slot already booking then not consider it 123 time slot,Select the Tickets view Open Ticket ID XYZ On the Items tab, click on Add and select Product ID 123 (123 represents the

123 time slot,I want to check that how many 20 min slot possible from start and end time => it will also check if some time slot already booking then not consider it