Thought I would post this here for opinions from those who have been in the industry longer than me.

When I checked out 4 days ago my schedule was to start reserve today 4am - 4pm. Yesterday when I was off scheduling left me a message to check online and self notify or call them back about a schedule change. This morning at 9am they called to tell me that I am swapped to 9-9 reserve for the week. I don't care when the time is and our contract has no provisions about swapping times. I live in base so it's not an issue of commuting. When I said that it was fine for the rest of the week but today I thought I started at 4am they simply said that's why we tried to notify you yesterday. Is there a legal conflict with this? I'm concerned a situation will arise where I believe that I started at a certain time and thus am only legal for 16 hours from then while scheduling believes I am legal longer. Should I just be checking my schedule and self notify on my day off? I like my job, I'm flexible and Im not trying to play games. I just don't want to end up in a conflict over legality.