Huh? No, not 1000 days. 365.25 days.
https://en.wikipedia.org/wiki/Julian_year_(astronomy)
https://en.wikipedia.org/wiki/Julian_calendar
https://en.wikipedia.org/wiki/Gregorian_calendar#Gregorian_reform
Hey....that is what I was instructed, and the department utilized for the 6 years that I worked there, until I had an opportunity to learn a new field of work.
Oct. 70 to Dec 76.