373 days ago (1 year, 8 days ago)

Monday, September 15, 2025

Monday, September 15, 2025 is a Monday. It is day 258 of 2025 (70.7% through the year), ISO week 38, in Q3.

Calendar dial and astronomical representation
Audio Almanac Briefing

Listen to daily astrological metrics, calendar specifications, and historical highlights for Monday, September 15, 2025.

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Comprehensive Date Metrics for Monday, September 15, 2025

ISO 8601 & Astronomical
Day of Year 258 / 365 % of 2025 passed
Days Left in Year 107 days Remaining until Jan 1, 2026
ISO Week Number Week 38 Quarter Q3
Day Classification Weekday Monday
Roman Numeral Date XV.IX.MMXXV Day.Month.Year
Julian Day Number (JDN) 2,460,933.5 Astronomical continuous count
Unix Epoch Timestamp 1757937600 Seconds since Jan 1, 1970 UTC
Moon Phase & Illumination Last Quarter 46% illuminated
Astrological Zodiac Sign Virgo Sun Sign
Calendar Season Summer in the Northern Hemisphere, winter in the Southern Hemisphere Northern hemisphere season
Leap Year Status Common Year (365 days) February has 28 days
Time Elapsed / Countdown 373 days ago (1 year, 8 days ago) Relative to today

Holidays & Observances

September 15
Observance Battle of Britain Day (United Kingdom)
Observance Joseph Abibos
Observance Alpinus (Albinus) of Lyon
Observance Aprus (Èvre) of Toul
Observance Catherine of Genoa
Observance James Chisholm (Episcopal Church)
Observance Saint Dominic in Soriano (formerly)
Observance Mamilian of Palermo

Date Overview & Context

Calendar Overview

Monday, September 15, 2025 combines practical calendar facts with a wider view of the day: 2017: A homemade bomb partially exploded on an eastbound District line train at Parsons Green tube station in West London, injuring 30 passengers.. Use it to check the date, plan across time zones, and scan the observances and historical markers attached to September 15.

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On This Day in History: September 15

10 Recorded Events

A homemade bomb partially exploded on an eastbound District line train at Parsons Green tube station in West London, injuring 30 passengers.

Parsons Green train bombing →

The Belarusian serial killer Ivan Kulesh murdered two saleswomen in Lida.

Ivan Kulesh →

Financial crisis of 2007–2008: The global financial services firm Lehman Brothers filed for bankruptcy while holding over $600 billion in assets, the largest such filing in U.S. history.

2008 financial crisis →

Three armed members of the Croatian National Resistance hijacked Scandinavian Airlines System Flight 130 in an attempt to force the release of those arrested for the assassination of the Yugoslav ambassador the previous year.

Croatian National Resistance →

The Ku Klux Klan bombed the 16th Street Baptist Church, an African-American church in Birmingham, Alabama, killing four girls and injuring at least 14 other people (memorial march pictured).

Ku Klux Klan →

The scene in The Seven Year Itch of Marilyn Monroe standing in a white dress over a subway grate was filmed by Billy Wilder.

The Seven Year Itch →

World War II: The Greek People's Liberation Army won the Battle of Meligalas and began the execution of many prisoners of war and civilians.

World War II →

World War II: American and Australian forces landed on the Japanese-occupied island of Morotai.

World War II →

Nazi Germany enacted the Nuremberg Laws (pictured), which deprived Jews of their citizenship.

Nazi Germany →

Tanks (example pictured), the "secret weapons" of the British Army during the First World War, were first used in combat at the Battle of Flers–Courcelette in France.

Tank →

Notable Memorials & Deaths

In Memoriam

Frequently Asked Questions about Monday, September 15, 2025

What day of the week was or is Monday, September 15, 2025?

Monday, September 15, 2025 falls on a Monday.

How many days ago or from now is Monday, September 15, 2025?

373 days ago (1 year, 8 days ago). It is day 258 of 2025 with 107 days remaining in the year.

What is the Roman numeral format for Monday, September 15, 2025?

In Roman numerals, Monday, September 15, 2025 is written as XV.IX.MMXXV (Day.Month.Year format).

What was the moon phase and zodiac sign on Monday, September 15, 2025?

The moon phase for this date is Last Quarter (approx. 46% illuminated). The astrological sun sign is Virgo.