Originally Posted by aaac
According to the official rules, it would be 00:01AM on Tuesday. That said, you may get lucky and got hold of an agent who may upgrade you the day before.
It's 0001 on Mon, not Tue.
Using Shareholder's example of Fri at 1500:
1 day prior Thu 1500
2 days prior Wed 1500
3 days prior Tue 1500
4 days prior Mon 1500
So 4 days prior is Mon and you can officially U/G at 0001 on Mon.