To find out what day it was 80 days ago from December 13th, you can subtract 80 days from that date.
Starting from December 13th:
- December has 31 days, so from December 13th to December 1st is 12 days.
- That leaves 80 - 12 = 68 days to go back further into November.
Next, subtract the days in November:
- November has 30 days, so from November 30th to November 1st is 30 days.
- That leaves 68 - 30 = 38 days into October.
Now subtract the days in October:
- October has 31 days, so from October 31st to October 1st is 31 days.
- That leaves 38 - 31 = 7 days into September.
Finally, going back 7 days from September 30th takes us to September 23rd.
Therefore, 80 days ago from December 13th was September 23rd.