The criteria to be applied is the reference time e.g. the local time (LT) where the crew member reported for duty.
Example with “Late type” of Disruptive schedule:
LT in A = LT in B + 1 hour.
Day 1: The crew member starts the FDP acclimatised to A. He/she reports at 15:00 (LT-A) and finishes FDP in B at 23:30 (LT-B). It is a ‘Late finish’ because he/she is acclimatised to A, and FDP finishes at 00:30 (LT-A).
Rest in B. After resting in B, which is within two hours’ time difference from A, the crew member gets acclimatised to B.
Day 2: The crew member reports in B at 15:00 (LT-B) and finishes FDP in A at 00:30 (LT-A). It is not a late finish, because he/she is acclimatised to B, and the FDP finishes at 23:30 (LT-B).