calculators
Calendar Week Calculator
Enter a year and ISO week number to see the Monday and Sunday dates of that week. Free and client-side.
Frequently Asked Questions
What is an ISO week?
ISO weeks start on Monday. Week 1 is the week containing the first Thursday of the year.
What format is the output?
The output shows the Monday date and Sunday date of the selected week.
Is my data sent to servers?
No. All calculations happen locally in your browser.