I am trying to write an on-call schedule and I want to keep times from overlapping. Example:

person   start end
person A 00:00-06:00
person B 06:00-12:00  # This is a good schedule

person A 00:00-06:00
person B 05:00-12:00  # This is bad because the times overlap.

Can anyone point me at module that I could use to help with this?

Update: Changed 'Calendar' to 'schedule'.

In reply to Managing a on-call Schedule by Herkum

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