World Calendars
Gregorian date today
The calendar used in most parts of the world. Pope Gregory XIII introduced it in 1582 because the older Julian calendar had let the seasons slip about ten days.
11 November 2026
Wednesday, ISO week 46, day 315 of the year
- In the Gregorian calendar
- Wednesday 11 November 2026
- This day began
- At midnight, as Wednesday 11 November 2026 begins
- This day ends
- At midnight, as Thursday 12 November 2026 begins
- Year 2026 began
- Thursday 1 January 2026
- Next new year
- Friday 1 January 2027 (in 51 days)
- This year has
- 365 days in 12 months
- Year 1 began
- 1 January AD 1 (Gregorian calendar counted backwards)
- Who uses it
- Most of the world, for everyday dates
- A year has
- 365 days, or 366 in a leap year
- How it works
- Leap day every fourth year, skipped in 1800 and 1900 but kept in 2000
- Unusual detail
- In 1582, Thursday 4 October was followed by Friday 15 October
Next holidays in this calendar
44 days
25 December 2026 · Gregorian
51 days
1 January 2027 · Gregorian, Japanese era, Thai solar (Buddhist era), Republic of China (Minguo), Juche, Holocene (Human Era), Discordian, Revised Julian, Soviet work week
137 days
28 March 2027 · Gregorian
How the Gregorian calendar works
A year divisible by 4 is a leap year, except a year divisible by 100 and not by 400. So 1600 and 2000 were leap years, and 1800 and 1900 were not. That gives an average year of 365.2425 days. Every 400 years hold 146,097 days, exactly 20,871 weeks, so the whole calendar, weekdays included, repeats every 400 years.
| No. | Month | Days |
|---|---|---|
| 1 | January | 31 |
| 2 | February | 28 (29 in leap years) |
| 3 | March | 31 |
| 4 | April | 30 |
| 5 | May | 31 |
| 6 | June | 30 |
| 7 | July | 31 |
| 8 | August | 31 |
| 9 | September | 30 |
| 10 | October | 31 |
| 11 | November | 30 |
| 12 | December | 31 |
The ISO 8601 standard adds a week count. Weeks run Monday to Sunday, and week 1 is the week with the year's first Thursday in it, which is also the week that contains 4 January. A week-numbering year has 52 or 53 weeks; 71 years in every 400 have a week 53. A week date is written year, week, weekday: Sunday 10 May 2026 is 2026-W19-7.
The day of the year runs from 1 to 365, or 366 in a leap year. ISO 8601 calls a date written this way an ordinal date: 5 April 1981 is 1981-095.
Variants and the method used here
The rules have no variants, so every source gives the same date. The day shown is the day in your own time zone. The week number follows ISO 8601. Near New Year the week-numbering year can differ from the calendar year by up to three days: 29 December 2025 is 2026-W01-1. When that happens the card names the week's year.
The converter runs the same rules backwards before the calendar existed. This is called the proleptic Gregorian calendar. ISO 8601 allows it for years before 1583 only by agreement between the parties exchanging dates. People in Britain before September 1752 or in Russia before 1918 wrote their dates in the Julian calendar, and the Julian calendar page converts those. Years before AD 1 are shown as BC, with no year 0; ISO 8601 numbers 1 BC as year 0000.
A short history
Pope Gregory XIII issued the reform in the bull Inter gravissimas, dated 24 February 1582. Aloysius Lilius proposed the scheme and Christopher Clavius expanded and defended it. The Julian calendar's year of 365.25 days had let the March equinox drift to around 10 or 11 March, while the church fixed it at 21 March for the date of Easter.
Thursday 4 October 1582 was followed by Friday 15 October 1582: ten dates were dropped and the weekdays carried on unbroken. Spain, Portugal, Italy and the Polish-Lithuanian Commonwealth switched that year. Britain and its colonies followed in 1752, when Wednesday 2 September was followed by Thursday 14 September. Japan adopted the calendar in 1873, China in 1912, Russia in 1918 and Greece, the last European country to change for civil use, in 1923.
Sources
How this site calculates the date: Gregorian calendar with ISO 8601 week numbers (weeks start on Monday; week 1 holds the first Thursday).