Day of the Week Calculator

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Find out what day of the week any date falls on, plus the day of the year, ISO week number, whether it's a weekday or weekend, and how many days from today. Free and instant.

Pick any past or future date to find its weekday and more.

Day of the week –
Day of year –
ISO week number –
Type –
From today –
The weekday name is shown in your browser's language. ISO week numbers start on Monday. The day count from today is measured midnight to midnight in your local time.

About Day of the Week Calculator

The day of the week calculator tells you what weekday any date falls on — past or future. Wondering what day of the week you were born, or which weekday a deadline lands on in two years? Pick the date and the answer appears instantly, with no calendar scrolling.

The tool goes beyond the weekday name: it shows the day of the year, the ISO week number, whether the date is a weekday or a weekend, and how many days it is from today — labeled “ago” for past dates or “from now” for future ones, measured midnight to midnight in your local time.

ISO weeks start on Monday, and the weekday name follows your browser’s language, so the output matches how dates are written where you are. It is free, instant and works for any date the calendar supports.

How to use Day of the Week Calculator

  1. Pick any past or future date, or press “Use today”.
  2. Read the day of the week for that date.
  3. Check the extras: day of year, ISO week number, weekday/weekend type and the distance from today.

Frequently asked questions

Enter your birth date in the date field. The calculator immediately shows the weekday, plus how many days ago that was and which ISO week of the year it fell in.

Yes. Pick any upcoming date to see its weekday, whether it is a working day or a weekend, and exactly how many days from now it occurs — useful for planning deadlines and events.

The difference is measured midnight to midnight in your local time, so it reflects whole calendar days rather than 24-hour blocks from the current moment.

Dates falling Monday through Friday are marked as weekdays, while Saturday and Sunday are marked as weekend — a quick check when scheduling around working days.

The calculator uses your browser’s locale to format the name, so a French browser sees “mercredi” where an English one sees “Wednesday” — the underlying date math is identical.
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