December 24th, 1004 was a Monday.
December 22nd, 1004 - January 20th, 1005
Why not celebrate an alternative birthday? In 873 days, exactly on December 15th, 2028, people who were born on December 24th, 1004 will be 374,000 days old!
Fixed holidays (Christian feast day, Christmas Eve) which are celebrated on December 24th.
| M = 1000 | X = 10 | IV = 4 | I = 1 |
Yes: 1004 is a leap year, therefore has a 29th of February with an additional leap day and a total of 366 days (instead of the usual 365 days in a normal year).