Gregorian

Gregorian Date Today

As of Tuesday, May 19, 2026 at 11:29 PM, today's Gregorian date is:

Tuesday, May 19, 2026

Today's Gregorian date — full detail

Date
Year
2026 AD (Anno Domini) / CE (Common Era)
Gregorian
Tuesday, May 19, 2026
Today (Gregorian)
Tuesday, May 19, 2026
ISO 8601 date
2026-05-19
ISO week-date
Week 21 of 2026
Day of year
139 of 2026
Leap year rule
Every 4 years, except centuries not divisible by 400
Accuracy
~1 day drift per 3,300 years against the tropical year

Why today matters

Today's Gregorian date is the global civil standard — the calendar of passports, contracts, news reports, train timetables, software systems, scientific publications, and international treaties. Even countries that maintain a parallel religious or national calendar (Iran with its Solar Hijri, Israel with the Hebrew, Saudi Arabia with the Islamic, Ethiopia with the Ge'ez, Japan with its imperial nengō) use the Gregorian calendar for international interaction. Today, Tuesday, May 19, 2026, is day 139 of 2026 — week 21 in ISO 8601 reckoning.

Pope Gregory XIII's 1582 reform was, on its surface, a 10-day correction — but it has turned out to be the world's most successful piece of timekeeping legislation. Four centuries on, no one can imagine running an airline schedule by any other calendar.

How we compute this

Gregorian is a solar calendar. Each year contains 365 days; 366 in leap years (every 4 years, except centuries not divisible by 400), with each month averaging 28–31 days. Years are counted from Anno Domini 1 — calculated by the monk Dionysius Exiguus in 525 CE (era: AD (Anno Domini) / CE (Common Era)).

The Gregorian calendar was promulgated by Pope Gregory XIII on 24 February 1582 in the papal bull Inter gravissimas, replacing the Julian calendar that had been in use since Julius Caesar's reform of 45 BCE. The reform did two things: it corrected a 10-day drift that had accumulated against the spring equinox (Thursday 4 October 1582 was followed by Friday 15 October 1582), and it adjusted the leap-year rule to drop three leap days every 400 years (years divisible by 100 but not 400 are no longer leap, so 1700, 1800, and 1900 were ordinary years; 2000 was a leap year). Adoption was slow and politically charged: Catholic countries (Spain, Portugal, Italy, the Papal States, France) switched immediately in 1582–1583. Protestant and Orthodox countries resisted on religious grounds for centuries. Britain and its American colonies switched in September 1752, skipping eleven days (the "Eleven Days Riot" of British folklore is largely apocryphal, but the change was real). Russia switched in 1918 under the Bolsheviks. Greece switched in 1923. Turkey in 1926. Saudi Arabia adopted the Gregorian calendar for civil business in 2016 — the last major holdout. Eastern Orthodox churches continue to use the Julian calendar for liturgical purposes, which is why Russian Orthodox Christmas falls on 7 January (= 25 December Julian).

Used by: Virtually every country on earth — the de facto global civil standard. Regions: Universal civil use; adopted progressively from 1582 to 2016.

Frequently asked

What is the Gregorian date today?
Today's Gregorian date is Tuesday, May 19, 2026. In ISO 8601 format: 2026-05-19. This is day 139 of the year and ISO week 21.
Why was the Gregorian calendar created?
To fix the drift in the Julian calendar. The Julian year (365.25 days) was 11 minutes 14 seconds longer than the tropical year (the actual time the Earth takes to return to the same position relative to the sun). Over 13 centuries this added up to a 10-day error, with the result that the spring equinox — which the Council of Nicaea (325 CE) had fixed at 21 March for the purpose of calculating Easter — was happening on 11 March by 1582. Pope Gregory XIII's reform corrected the drift and adjusted the leap-year rule to prevent it from recurring.
When did different countries adopt the Gregorian calendar?
1582: Catholic countries (Spain, Portugal, Italy, France, Polish-Lithuanian Commonwealth). 1610: Prussia. 1700: Most Protestant German states, the Netherlands. 1752: Britain and its American colonies. 1873: Japan. 1875: Egypt. 1912: China. 1918: Russia. 1923: Greece. 1926: Turkey. 2016: Saudi Arabia (civil use only). The Eastern Orthodox churches continue to use the Julian calendar for ecclesiastical purposes — which is why Russian, Serbian, and Georgian Orthodox Christmas falls on 7 January in Gregorian reckoning.
Is the Gregorian calendar perfectly accurate?
No — the Gregorian average year is 365.2425 days, while the actual tropical year is 365.2422 days. This produces a drift of about one day every 3,300 years. By around the year 4900 CE, the cumulative drift will be roughly one day, at which point the spring equinox will be a day earlier in the calendar than today. Several reform proposals have been advanced (omit the leap year in 4000, 4400, 4800; or use a more sophisticated rule) but no consensus has emerged.
What's the difference between AD/BC and CE/BCE?
AD (Anno Domini, "in the year of our Lord") and BC (Before Christ) are the traditional Christian designations. CE (Common Era) and BCE (Before Common Era) are equivalent designations preferred in academic, scientific, and interfaith contexts because they don't presuppose Christian belief about the year zero — though they reference the same year (and the same arbitrary 6th-century miscalculation by Dionysius Exiguus, who almost certainly placed the birth of Jesus several years too late). There is no year zero in either system; 1 BCE/BC is followed immediately by 1 CE/AD.
How does the Gregorian week work?
The Gregorian week is the same seven-day week inherited from Babylonian and Jewish tradition, named after the seven classical planetary deities (Sun, Moon, Mars, Mercury, Jupiter, Venus, Saturn) in most European languages. ISO 8601 defines the week as starting Monday — the international standard for business and computing. American convention starts the week on Sunday — the Jewish/Christian liturgical convention. Many calendars and software systems offer either as a setting.

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