December 31st, 1001 was a Thursday.
December 22nd, 1001 - January 20th, 1002
Why not celebrate an alternative birthday? In 784 days, exactly on September 17th, 2028, people who were born on December 31st, 1001 will be 375,000 days old!
Fixed holidays (Christian feast day, New Year's Eve) which are celebrated on December 31st.
| M = 1000 | X = 10 | I = 1 |
No: With 365 days 1001 is a normal year and no leap year.