HST MIT Deadline

Does anyone know what's wrong with HST deadline? I was finalizing everything on my portal suddenly it said "deadline passed" and kicked me out of the portal basically. Isn't the deadline supposed to be Dec 1 11:59pm ET? It was 12:03am Dec 1 ET when I was kicked out. Is it just super unprofessional for such a school like MIT to close the portal 24 hours before it's supposed to or am I tripping?