September 21st, 1240 was a Friday.
August 24th, 1240 - September 23rd, 1240
Why not celebrate an alternative birthday? In 977 days, exactly on March 29th, 2029, people who were born on September 21st, 1240 will be 288,000 days old!
Fixed holidays (Autumnal equinox observances in the Northern Hemisphere, vernal equinox observances in the Southern Hemisphere , Christian feast day) which are celebrated on September 21st.
| M = 1000 | C = 100 | XL = 40 | X = 10 | IX = 9 | I = 1 |
Yes: 1240 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).