import sys
from datetime import date, timedelta
# Return all last Sundays of each month in a given year
def last_sundays_of_year(year):
for month in range(1, 13):
# Last day of the month
d = date(year, month, 1)
d = d.replace(day=28) + timedelta(days=4) # jump to next month
d = d.replace(day=1) - timedelta(days=1) # last day of this month
# Walk backward to Sunday
while d.weekday() != 6: # Sunday = 6
d -= timedelta(days=1)
yield d
def main():
year = int(sys.argv[1]) if len(sys.argv) > 1 else 2026
for d in last_sundays_of_year(year):
print(d.strftime("%m/%d/%Y"))
if __name__ == "__main__":
main()
"""
run:
01/25/2026
02/22/2026
03/29/2026
04/26/2026
05/31/2026
06/28/2026
07/26/2026
08/30/2026
09/27/2026
10/25/2026
11/29/2026
12/27/2026
"""
