What Day Is It? — Day of the Week for Any Date

Today's day of the week, plus a lookup for any other date. Enter a birthday, an anniversary or a historical date and it returns the weekday along with the ISO week number and day of year.

Working it out in your head

There is a well-known mental method — the Doomsday rule — that lets you find the weekday of any date with practice, by anchoring on a handful of dates that always fall on the same day within a given year. It is described in what day was I born, though the calculator above is faster.

Guides about Day of the Week

Quick answers Monday vs Sunday Week Start: Which Is Right and Why It Matters Some calendars start on Monday, others on Sunday, and both are defensible. Here is where each convention came from, which software uses which, and what changes. 5 min read Quick answers What Day Was I Born? How to Work Out the Weekday of Any Date Every date falls on a weekday you can calculate. Here is the Doomsday method in outline, the century anchor days, and the fastest way to just look it up. 6 min read

More midweek.now pages

Is It Midweek? A straight answer, the week's progress as a live percentage, and a countdown to Wednesday. Weekend Countdown A live countdown to Friday evening — and on the weekend, how long is left of it. Week Progress The week as a live percentage, with each day marked off as it passes.

Frequently asked questions

What day is it today?

Today's weekday is shown above, along with its position in the ISO week.

What day of the week was I born?

Enter your date of birth above and it returns the weekday, the ISO week number and the day of the year.

How far back does it work?

It handles any date your browser's calendar supports, which covers the whole Gregorian era comfortably.