Days Since Modern Events

How many days since
September 11 Attacks?

Q: How many days since September 11 Attacks?

Use the live elapsed counter on this page to see exactly how many days since September 11 Attacks on 11 September 2001.

Q: How many weeks since September 11 Attacks?

The live counter on this page shows the exact weeks elapsed since September 11 Attacks.

Q: What day of the week was September 11 Attacks?

September 11 Attacks was on a Tuesday, 11 September 2001.

September 11 Attacks was on 11 September 2001 — a Tuesday

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8,984days ago

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24.6years ago

2001year it happened

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What happened on September 11 2001 — timeline

7:59am — American Airlines Flight 11 departs Boston for Los Angeles. 8:14am — United Airlines Flight 175 departs Boston. 8:20am — American Airlines Flight 77 departs Washington Dulles. 8:42am — United Airlines Flight 93 departs Newark. 8:46am — Flight 11 strikes the North Tower of the World Trade Center. 9:03am — Flight 175 strikes the South Tower. 9:37am — Flight 77 strikes the Pentagon, killing 189. 9:59am — The South Tower collapses, 56 minutes after impact. 10:03am — Flight 93 crashes in a field near Shanksville, Pennsylvania. 10:28am — The North Tower collapses, 102 minutes after impact. By the end of the day, 2,977 people had been killed — the deadliest terrorist attack in history.

The long-term health impact

The health consequences of 9/11 extended far beyond the immediate death toll. Approximately 400,000 people were exposed to toxic dust and debris from the collapsed towers, including asbestos, heavy metals, benzene and other carcinogens. The World Trade Center Health Program has since enrolled over 100,000 participants — first responders, survivors and area residents. As of 2024, over 3,000 people have died from illnesses linked to their 9/11 exposure, including cancers and respiratory diseases, meaning the attack's death toll continues to rise more than two decades later. Congress passed the James Zadroga 9/11 Health and Compensation Act in 2010 to fund treatment for affected individuals, extended permanently in 2019.

9/11 and global security — the lasting legacy

The security infrastructure created in response to 9/11 has fundamentally reshaped daily life in ways that have become normalised. The global aviation security system — removing shoes, liquid restrictions, full-body scanners — was created almost entirely in the years after 9/11. The NSA's mass surveillance programme, revealed by Edward Snowden in 2013, was a direct product of post-9/11 intelligence legislation. The wars in Afghanistan and Iraq, triggered by the attacks, cost the United States an estimated $8 trillion and killed approximately 900,000 people. The 9/11 Commission Report, published in 2004, remains one of the most read government documents in US history and fundamentally reformed the US intelligence community.

About September 11 Attacks

On the morning of 11 September 2001, nineteen terrorists coordinated by al-Qaeda hijacked four commercial aircraft in the United States. At 8:46am Eastern Time, American Airlines Flight 11 struck the North Tower of the World Trade Center in New York City. Seventeen minutes later, United Airlines Flight 175 struck the South Tower. At 9:37am, American Airlines Flight 77 crashed into the Pentagon in Arlington, Virginia. The fourth aircraft, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania after passengers attempted to overpower the hijackers.

Both World Trade Center towers collapsed — the South Tower at 9:59am and the North Tower at 10:28am — due to structural failure caused by the fires. A total of 2,977 people were killed, excluding the 19 hijackers. The victims came from more than 90 nations. Among the dead were 412 emergency workers — 343 firefighters and paramedics from the New York City Fire Department, 23 NYPD officers and 37 Port Authority police officers — many of whom entered the towers to rescue survivors.

The attacks fundamentally altered global geopolitics, security, aviation, surveillance, civil liberties and international relations. The United States declared a War on Terror, invaded Afghanistan in October 2001 and Iraq in March 2003. The Transportation Security Administration was created. Airport security worldwide was transformed overnight. The Department of Homeland Security was established with a $40 billion annual budget.

The 9/11 Memorial and Museum now occupy the footprint of the Twin Towers. The Reflecting Absence memorial features two vast reflecting pools in the towers' footprints, with the names of all 2,977 victims inscribed on bronze parapets surrounding them. One World Trade Center — at 541 metres the tallest building in the Western Hemisphere — opened in November 2014. The events of 11 September 2001 remain the defining moment of the early 21st century.

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