What Day Is It Today?
A simple, live answer — which day of the week it is, plus the full date in Gregorian and the week and day-of-year numbers.
What day was / will be any date?
Pick any date to find what day of the week it falls on.
What day is it today?
The quickest possible answer: today's day of the week is shown at the top of this page, updated live. The full Gregorian date, ISO week number, and day-of-year are also shown.
The seven days of the week
The seven-day week is one of the most universal human conventions, used nearly everywhere on Earth despite having no astronomical basis. It is an inheritance from ancient Babylon, preserved across Jewish, Roman, Christian, Islamic, and secular calendars for over two millennia.
| ISO № | Day | Named after |
|---|---|---|
| 1 | Monday | The Moon (Old English Mōnandæg) |
| 2 | Tuesday | Tiw, Norse god of war |
| 3 | Wednesday | Woden / Odin |
| 4 | Thursday | Thor |
| 5 | Friday | Frigg / Freya |
| 6 | Saturday | Saturn (Roman) |
| 7 | Sunday | The Sun |
ISO day numbering
Under ISO 8601, days of the week are numbered 1 to 7 starting with Monday. This is different from the common US convention (where Sunday is often "day 1") and from JavaScript's Date.getDay() (where Sunday is 0 and Saturday is 6). Be careful when comparing day numbers across systems.
Finding what day a specific date falls on
Use the converter above to find what day any past or future date falls (or fell) on. Birthdays, historical events, project deadlines — pick a date and you'll get the weekday instantly.
Finding the day of the week for any date
There's a mental-math trick called Zeller's congruence that lets you find the day of the week for any date without a calendar. It's an odd parlor trick that works for Gregorian dates — but in practice, just use the converter above.
Working days vs calendar days
When someone says "five days from Thursday," they might mean:
- Five calendar days — Friday, Saturday, Sunday, Monday, Tuesday
- Five business days (skipping weekends) — Friday, Monday, Tuesday, Wednesday, Thursday
Contracts, shipping estimates, and legal deadlines usually mean business days unless specified otherwise. "30 days" in a credit-card billing context usually means calendar days; "30 days" in a legal deadline often means business days in some jurisdictions. Always check.
Day counting across ISO, US, and calendar apps
Be careful when comparing "day-of-week numbers" across systems:
| System | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|---|
| ISO 8601 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
JavaScript getDay() | 1 | 2 | 3 | 4 | 5 | 6 | 0 |
Excel WEEKDAY() (default) | 2 | 3 | 4 | 5 | 6 | 7 | 1 |
PHP date("w") | 1 | 2 | 3 | 4 | 5 | 6 | 0 |
When exchanging data between systems, convert to the ISO 8601 numbering before comparing.
What day of the week was I born?
Use the converter above to find out. Most people alive today were born between Monday and Friday (roughly 71% — because births are often induced or scheduled on weekdays). Saturday and Sunday births have declined as a proportion of total births since the 1990s due to scheduled deliveries and elective C-sections.
Fun with day-of-the-week statistics
- The 13th of a month is slightly more likely to fall on a Friday than any other day — a consequence of the Gregorian calendar's 400-year leap cycle.
- Over 400 years, Friday occurs 688 times as the 13th; Sunday and Wednesday occur 687 times; Monday and Tuesday 685 times; Thursday and Saturday 684 times.
- The pattern 31 days → 31 days → 30 days means a given month often starts on a different day of the week each year.