Find common agenda across two or more calendars.
Considering the two calendars below, where ### represents a booked period:
Calendar 1 08:00 ----------- 10:00#######11:00--------------------------------------------------17:00 Calendar 2 08:00 ----- 09:00#############11:00-------------13:00#########14:00------------------17:00
The common free slots between them would be:
- 08:00 - 09:00
- 11:00 - 13:00
- 14:00 - 17:00