Sorry, I will try to be clearer on what happened.
I have a cru command "cru a start "55 4 * * 0,1,2,3,4,5,6"" so it starts at 4:55 every day. At 2024-03-10 it started at 3:55. That is the time US changes to DST. My router was not on US DST, so it should not have started at 3:55, it should have...