I had an aircraft due for D-check on 26th of May. When I logged in, it was on 25th, so I quickly started moving the schedule to another aircraft, in order to end the lease. However, the aircraft already entered D-check on 25th. I attached a screenshot, in the message it says 26th of May, the actual date was 25th of May. I did refresh the page before taking the screenshot, to be sure it wasn't a browser issue.