December 21st, 1428

Born on December 21st, 1428

Age in days, weeks and months
Wow, over 218,000 days old!

Why not celebrate an alternative birthday? In 733 days, exactly on July 28th, 2028, people who were born on December 21st, 1428 will be 219,000 days old!

... in seconds, minutes and hours

What happened on December 21st?

December 21st, 2018

Operatives of the British Special Boat Service boarded the container ship Grande Tema in the Thames Estuary to detain four stowaways who had threatened the crew.

December 21st, 2012

Countries that were part of the Maya civilization celebrated the end-date of a 5,126-year-long cycle in the Mesoamerican Long Count calendar.

December 21st, 1994

Mexico's Popocatépetl volcano, dormant for 47 years, began erupting, and is now one of the nation's most active volcanoes.

December 21st, 1988

A bomb on board Pan Am Flight 103 detonated over Lockerbie, Scotland, killing 270 people.

December 21st, 1970

The Grumman F-14 Tomcat, the primary fighter aircraft of the U.S. Navy for nearly 30 years, made its first flight.

December 21st, 1968

Apollo 8 launched from Kennedy Space Center in Florida on a trajectory to the Moon; its crew (pictured) became the first humans to visit another celestial body.

December 21st, 1965

The United Nations adopted the International Convention on the Elimination of All Forms of Racial Discrimination, which 88 member states have since signed.

December 21st, 1963

An attempt by Greek Cypriot police to search certain Turkish Cypriot women in Nicosia escalated into island-wide violence, leading to 538 deaths and the displacement of nearly 27,000 people.

December 21st, 1937

Snow White and the Seven Dwarfs, the first full-length cel-animated feature in film history, premiered at the Carthay Circle Theatre in Los Angeles.

December 21st, 1934

Lieutenant Kijé, the first film composition by Sergei Prokofiev (pictured), premiered.

December 21st, 1923

Nepal and the United Kingdom signed the first treaty that defined the international status of Nepal as an independent and a sovereign nation.

December 21st, 1872

HMS Challenger departed Portsmouth on a scientific expedition that laid the foundations of oceanography.

December 21st, 1826

Settlers from the United States in Mexican Texas made the first attempt to secede from Mexico, establishing the short-lived Republic of Fredonia.

December 21st, 1620

The Pilgrims aboard the Mayflower landed at present-day Plymouth, Massachusetts, to establish the Plymouth Colony.

December 21st, 1992

Martinair Flight 495 crashed on landing at Faro Airport due to a downburst, killing 56 out of the 340 people on board.

Public holidays on December 21st

Fixed holidays (Christian feast day, Earliest usual date for the winter solstice in the Northern Hemisphere and the summer solstice in the Southern Hemisphere, and its related observances) which are celebrated on December 21st.

Date as a Roman numeral / digit

Leap year

Yes: 1428 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
December 1428