📆 Week Number
What week of the year is any date
About this calculator
Which week of the year is it? Enter any date and the calculator returns its ISO 8601 week number — weeks starting Monday, with week 1 containing the first Thursday — the standard used in business and payroll across Canada and Europe. It also shows whether the year has 52 or 53 weeks.
Tip: the ISO week year can differ from the calendar year — early January dates sometimes belong to week 52 or 53 of the previous year.