Tuesday, September 9, 2025 is a Tuesday. It is day 252 of 2025 (69% through the year), ISO week 37, in Q3.
Calendar Specifications
Tuesday, September 9, 2025 combines practical calendar facts with a wider view of the day: 2015: Elizabeth II (pictured) became the longest-reigning monarch of the United Kingdom, surpassing Queen Victoria.. Use it to check the date, plan across time zones, and scan the observances and historical markers attached to September 9.
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Historical Milestones
Elizabeth II (pictured) became the longest-reigning monarch of the United Kingdom, surpassing Queen Victoria.
Elizabeth II →A natural-gas pipeline in San Bruno, California, exploded and "shot a fireball more than 1,000 feet (300 m) in the air", killing eight people.
Natural gas →Two al-Qaeda attackers assassinated Ahmad Shah Massoud, a pivotal Afghan resistance leader, two days before the September 11 attacks in the United States.
al-Qaeda →The first banknotes of the Portrait Series of the Singapore dollar were introduced by the Board of Commissioners of Currency.
Singapore Portrait Series currency notes →Imagine, the second solo album by John Lennon (pictured), was released.
Imagine (John Lennon album) →Allegheny Airlines Flight 853 collided in mid-air with a Piper PA-28 Cherokee flown by a student pilot near Fairland, Indiana, killing all 83 occupants of and destroying both aircraft.
Allegheny Airlines Flight 853 →French president Charles de Gaulle delivered his "speech to the German youth" to 20,000 people in the courtyard of Ludwigsburg Palace (pictured).
Charles de Gaulle →U.S. president Dwight D. Eisenhower signed the Civil Rights Act of 1957, the first civil rights bill since Reconstruction.
Dwight D. Eisenhower →A magnitude-6.7 earthquake struck near Chlef, killing over 1,200 people and forcing the Algerian government to implement comprehensive reforms in building codes.
1954 Chlef earthquake →World War II: About 3,000 Polish Army troops began a nearly month-long defence of the Hel Peninsula during the German invasion of Poland.
World War II →Calculate business days and elapsed calendar time between this date and any other.
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Questions & Answers
Tuesday, September 9, 2025 falls on a Tuesday.
379 days ago (1 year, 14 days ago). It is day 252 of 2025 with 113 days remaining in the year.
In Roman numerals, Tuesday, September 9, 2025 is written as IX.IX.MMXXV (Day.Month.Year format).
The moon phase for this date is Full Moon (approx. 96% illuminated). The astrological sun sign is Virgo.