Return a named tuple containing ISO year, week number, and weekday.
>>> import datetime as dt >>> dt.date(2003, 12, 29).isocalendar() datetime.IsoCalendarDate(year=2004, week=1, weekday=1) >>> dt.date(2004, 1, 4).isocalendar() datetime.IsoCalendarDate(year=2004, week=1, weekday=7)
datetime/date.isocalendar
date.isocalendar