all Python 3datetimefunction

datetime.date.isoweekday()

datetime methods

Returns the ISO day of the week: 1 is Monday, 7 is Sunday. Unlike weekday(), the numbering starts at 1.

Syntax

date.isoweekday() -> int  # 1=Mon … 7=Sun

Pick by what the number feeds into: weekday() is the one that indexes a zero-based list of day names, while isoweekday() lines up with the third field of isocalendar() and with ISO week numbering. Hence the classic off-by-one — the weekend is 5 and 6 under weekday() but 6 and 7 under isoweekday().

Examples

from datetime import date
d = date(2024, 6, 17)   # понедельник
print(d.isoweekday())   # 1
print(d.weekday())      # 0

See also

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