I had a part-time child who was on a set schedule I got 1 month in advance. They were constantly moving days last minute. I had enough. I changed my contract to read that in the event they need a different day than already scheduled one month prior that it was counted as an additional day. It happened once and caught them off guard. They did not like their big daycare bill that pay period! It quit immediately. They shortly after gave notice and left. They needed different care than I was willing to provide. I had a hard time planning and felt like a drop in centre. Nope!! Put your foot down and say no.