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Time Since the U.S. Constitution Signing

Monday, September 17, 1787
87191
DAYS SINCE
01 hours
37 minutes
48 seconds

About this date

Constitution Signed

The U.S. Constitution was signed on September 17, 1787. This page provides a large time-since clock for the signing date and related U.S. history milestones.

How this countdown is calculated

  • Date certainty: exact.
  • Date maintenance: Fixed date.
  • Time policy: event timezone.

Quick facts

  • The U.S. Constitution was signed on September 17, 1787.
  • Constitution Day is observed on September 17.
  • The signing date is distinct from later ratification milestones.

Date sources

Questions

Common Questions

How long ago was the Constitution written?

The clock counts from September 17, 1787, the date the U.S. Constitution was signed.

Is this the Constitution Day date?

Yes. Constitution Day is observed on September 17, the anniversary of the signing.

Related

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Wednesday, December 6, 1865 American Civil War

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Sunday, April 9, 1865