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How to calculate the future occurrences of Friday the 13th in Python



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asked May 31, 2025 by avibootz
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1 Answer

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from datetime import datetime

def find_friday_the_13ths(start_year, end_year):
    for year in range(start_year, end_year + 1):
        for month in range(1, 13):
            date = datetime(year, month, 13)
            if date.weekday() == 4:  # Monday=0, Friday=4
                print(f"Friday the 13th: {year}-{month:02d}-13")

find_friday_the_13ths(2025, 2031)
     
 
 
'''
run:
  
Friday the 13th: 2025-06-13
Friday the 13th: 2026-02-13
Friday the 13th: 2026-03-13
Friday the 13th: 2026-11-13
Friday the 13th: 2027-08-13
Friday the 13th: 2028-10-13
Friday the 13th: 2029-04-13
Friday the 13th: 2029-07-13
Friday the 13th: 2030-09-13
Friday the 13th: 2030-12-13
Friday the 13th: 2031-06-13
  
'''

 



answered May 31, 2025 by avibootz

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