FREE · TIME & DATE TOOLS
Day of the Week Calculator.
Find the day of the week for any date, with the day of the year, the ISO week number, the quarter and the same date in the coming years.
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How to use Day of the Week Calculator
Choose a date. The weekday appears in English and seven other languages, with how many days away it is.
How it works
Dates are handled in UTC so time zones never shift the day. ISO weeks start on Monday; week 1 contains the year’s first Thursday.
Example
11 October 2026 is a Sunday, day 284 of the year, in ISO week 41; 1 January 2027 still belongs to ISO week 53 of 2026.
Questions about Day of the Week Calculator
Is Day of the Week Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
Gregorian calendar for every date. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.