For some reason, I have in my calendar for today:
VMS Epoch
http://h41379.www4.hpe.com/wizard/wiz_2315.html
Epoch of the Smithsonian Astrophysical Observatory, and is Julian Day
2400000 (to allow date to fit into a 36-bit word on the IBM 704).
When I visited that page, NoScript went bersek...
-- Dave