1. Until then
2. By then
By then it will be too late. The party starts at 7:00? That's okay – I should be ready by then.
3. Until such time
4. By now
Harry, who knew Diagon Alley very well by now
If he told the king, both our heads would be skewered on the city gates by now.
He should be finished by now.
You have been our student for over a year. You should have learned by now that we do not accept lateness.
5. up to that time