September 14th, 1276

Born on September 14th, 1276

Age in days, weeks and months
Wow, over 273,000 days old!

Why not celebrate an alternative birthday? In 120 days, exactly on November 22nd, 2026, people who were born on September 14th, 1276 will be 274,000 days old!

... in seconds, minutes and hours

What happened on September 14th?

September 14th, 2019

Drone attacks on major processing facilities at Abqaiq and Khurais forced Saudi Arabia to cut more than half of its oil production.

September 14th, 2015

Physicists of the LIGO and Virgo projects first observed gravitational waves, the existence of which was predicted by Henri Poincaré in 1905.

September 14th, 2007

Late-2000s financial crisis: The Northern Rock bank received a liquidity support facility from the Bank of England, sparking a bank run—the United Kingdom's first in 150 years.

September 14th, 2003

President Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless military coup.

September 14th, 1992

The Constitutional Court of Bosnia and Herzegovina declared the breakaway Croatian Republic of Herzeg-Bosnia to be unconstitutional.

September 14th, 1989

Typhoon Sarah dissipated after causing extensive damage along an erratic path across the Western Pacific, killing 71 in Taiwan, the Philippines, and the Gotō Islands.

September 14th, 1979

Afghan president Nur Muhammad Taraki (pictured) was overthrown and later killed on the orders of Hafizullah Amin, who succeeded him.

September 14th, 1960

At a conference held in Baghdad, the governments of Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela founded OPEC to help coordinate their petroleum policies and influence global oil prices.

September 14th, 1943

World War II: Nazi forces began a mass extermination campaign against the civilian residents of around 20 villages on the Greek island of Crete, eventually killing more than 500 men.

September 14th, 1940

Hungarian forces massacred at least 150 ethnic Romanians in Ip, Transylvania, following rumors that Romanians were responsible for the deaths of two soldiers.

September 14th, 1914

HMAS AE1 (pictured), the Royal Australian Navy's first submarine, was lost at sea; its wreck was not found until 2017.

September 14th, 1901

Theodore Roosevelt became President of the United States at age 42, the youngest person ever to do so, eight days after William McKinley was fatally wounded in Buffalo, New York.

September 14th, 1863

American Civil War: The Little Rock campaign ended with the Union Army capturing Little Rock, Arkansas.

September 14th, 1752

Under the terms of the Calendar (New Style) Act 1750, the British Empire adopted the Gregorian calendar, skipping 11 days of the month.

September 14th, 1723

António Manoel de Vilhena, Grand Master of the Knights Hospitaller, laid the first stone of Fort Manoel in Malta.

Public holidays on September 14th

Fixed holidays (Christian feast day) which are celebrated on September 14th.

Date as a Roman numeral / digit

Leap year

Yes: 1276 is a leap year, therefore has a 29th of February with an additional leap day and a total of 366 days (instead of the usual 365 days in a normal year).

Calendar
September 1276