Repeater with DatePicker

I've used Repeater with 2 DatePicker fields (start and end), may I know how can I validate if the newly added item from Repeater is an overlap to the existing or already added items?

Ex:

Start1: 2024-01-01 End1: 2024-01-30
Start2: 2024-01-04 End2: 2024-01-30 // OVERLAPPED
Start3: 2024-02-01 End2: 2024-02-20