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jcarlosroldan/weekday.py

Last active June 15, 2021 10:42
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Weekday computation
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weekday.py
WEEK_DAYS = 'mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'
def weekday(day: int, month: int, year: int) -> str: # You'd rather operate with datetimes, but this is funnier.
''' Computes the day of the week using Zeller's Congruence. '''
year_shift = year + year // 4 - year // 100 + year // 400
return WEEK_DAYS[(5 + day + (13 * (month + 1)) // 5 + year_shift) % 7]
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