makeatimerDates
ISO week number
Find the ISO week number, week year, and weekday for a date.
Inputs
Result
ISO weekday 5 (Friday). Week 1 contains January 4.
How to use iso week number
Look up the ISO week used in production schedules and weekly planning. The ISO week year can differ from the calendar year around New Year.
Worked example
January 1, 2021 belongs to 2020-W53. January 4, 2021 begins 2021-W01.
What the result means
ISO weeks start on Monday. Week 1 contains January 4, and the week year is shown explicitly.
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