My cousin is having a weird problem with the oblivion calendar. The date seems to jump randomly between any number (even negative values) and any month whenever she waits for just one day. Does anyone know what could cause this? Other characters with the same mod configuration have no problems.

Rowan,
Can you get the list of mods she has uploaded here? That would help.

Raed

Have you checked what TimeScale is set to?

Console:
Show TimeScale

If it's negative, it is meant to do bizzare things...