A hotel in France has the following cancellation policy (translated from French):
- Reservation for 1 to 4 nights: Cancel on the day of arrival without fees [...].
- Reservation for 5 to 27 nights: Cancel without fees until J-2, noon (GMT+1h). [...]
- Reservation for 28 nights and over: Cancel without fees until J-15, noon (GMT+1h). [...]
Does J-n mean a period of n days before the booked stay begins, or does it mean n days after the stay has begun? I think that it is most likely the former, but wanted to make sure. Would appreciate an answer from someone who knows for sure. An internet search didn't give me much.