U.S. observance
How Many Days Until Constitution Day 2027?
Today: · Eastern Time (America/New_York)
Calendar days until Constitution Day
328 days until Constitution Day
Constitution Day and Citizenship Day is on Friday, September 17, 2027.
Live countdown to midnight on September 17, 2027
327 days, 17 hours, 37 minutes, 2 seconds remaining
Eastern Time (America/New_York). Countdown days are 24 hours; the calendar-day count above uses local dates.
- Calendar days (signed)
- 328
- Full weeks + days
- 46 weeks + 6 days
- Calendar months + days
- 10 months + 24 days
- Years, months, days
- 0 years, 10 months, 24 days
- Weekdays counted
- 235
- Weekend days counted
- 93
- U.S. business days
- 225
- Observed holiday dates skipped
- 10
What is Constitution Day?
Constitution Day and Citizenship Day, September 17, commemorates the signing of the U.S. Constitution and honors everyone who has become an American citizen.
History of Constitution Day
On September 17, 1787, 39 delegates to the Constitutional Convention in Philadelphia signed the Constitution. Congress had celebrated new citizens on "I Am an American Day" from 1940, renamed Citizenship Day in 1952. A 2004 law sponsored by Senator Robert Byrd combined the two and requires schools that receive federal funds to teach about the Constitution on or around the date.
Constitution Day today
Schools and colleges hold lessons and readings, the National Archives hosts events, and U.S. Citizenship and Immigration Services holds special naturalization ceremonies for new citizens.
Date details
- Category
- U.S. observance
- How the date is set
- Same date every year
- Country / region
- United States
- Actual event date
Actual commemorative date, not a shifted school-program date. 36 U.S.C. 106. Source: U.S. Code (GovInfo)
Event date facts
- Weekday
- Friday
- ISO week / year
- 37 / 2027
- Day of year
- 260
- Quarter
- 3
- Days left in year
- 105
- Leap year
- No
September 2027
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| Target | ||||||
Event dates by year
| Rule year | Actual date | Observed federal closure | Certainty |
|---|---|---|---|
| 2025 | Wednesday, September 17, 2025 | — | Same date every year |
| 2026 | Thursday, September 17, 2026 | — | Same date every year |
| 2027 | Friday, September 17, 2027 | — | Same date every year |
| 2028 | Sunday, September 17, 2028 | — | Same date every year |
| 2029 | Monday, September 17, 2029 | — | Same date every year |
Quick answers
- What day of the week is September 17, 2027?
- September 17, 2027 is a Friday.
- Is Constitution Day a federal holiday?
- No. Constitution Day and Citizenship Day is not a U.S. federal holiday, so federal offices and most businesses stay open.
- What week of the year is September 17, 2027?
- September 17, 2027 is in ISO week 37 of 2027 and is day 260 of the year.
How the Constitution Day date is calculated
- Constitution Day is on September 17 every year. In 2027 that is a Friday.
- The countdown counts calendar days from today to September 17, 2027. The start date is excluded and the end date is included. Dates use Eastern Time (America/New_York).
- The live countdown runs to midnight at the start of September 17, 2027 in Eastern Time (America/New_York). A countdown day is 24 hours, so a daylight-saving change can make it differ from the calendar-day count by an hour.
- Calculated at 6:22 AM on October 24, 2026.
- U.S. business days exclude Saturday, Sunday and observed nationwide federal closures; individual employer and state schedules are not included.