journalctl day before yesterday

Hi *, how do I specify the day before yesterday for journalctl output? journalctl --all --since=yesterday --until=today gives all entries from midnight to midnight yesterday. journalctl --all --since=-3d --until=-2d seems to output all entries between 72 hours and 48 hours back from actual time. And I don't want to enter an exact date, because I'd like to create aliases for this. TIA. Bye. Michael.