How Many Days Until Constitution Day 2027?
There are 335 days until Constitution Day on Friday, September 17, 2027.
335 days
until Friday, September 17, 2027
When is Constitution Day 2027?
Constitution Day 2027 is on Friday, September 17, 2027. In the United States it is held on September 17 every year, so only the weekday changes. Next year's is on Sunday, September 17, 2028. Other names for it: Citizenship Day. It marks the signing of the US Constitution at Independence Hall in Philadelphia on September 17, 1787, when 39 delegates put their names to it. It also honors people who have become US citizens. Federal law sets the date, and schools that receive federal funds must hold an educational program on or near it.
| Year | Date | Day |
|---|---|---|
| 2026 | September 17, 2026 | Thursday |
| 2027 | September 17, 2027 | Friday |
| 2028 | September 17, 2028 | Sunday |
| 2029 | September 17, 2029 | Monday |
| 2030 | September 17, 2030 | Tuesday |
| 2031 | September 17, 2031 | Wednesday |
Date rule: 36 U.S.C. 106.
How many business days until Constitution Day?
Without weekends, Constitution Day is 240 weekdays away, Monday to Friday from tomorrow through Friday, September 17. Take out the 10 federal holidays on the way, Veterans Day through Labor Day, and the US count is 230 business days. Each country drops its own public holidays, so the UK gets 232, Canada 232 and Australia 234.
| Holidays used | Business days | Holidays skipped |
|---|---|---|
| United States (federal holidays) | 230 | Veterans Day, Thanksgiving Day, Christmas Day, New Year's Day, Martin Luther King Jr. Day, Washington's Birthday, Memorial Day, Juneteenth, Independence Day, Labor Day |
| UK (England and Wales bank holidays) | 232 | Christmas Day, Boxing Day, New Year's Day, Good Friday, Easter Monday, Early May bank holiday, Spring bank holiday, Summer bank holiday |
| Canada (federal statutory holidays) | 232 | Remembrance Day, Christmas Day, Boxing Day, New Year's Day, Good Friday, Victoria Day, Canada Day, Labour Day |
| Australia (national public holidays) | 234 | Christmas Day, Boxing Day, New Year's Day, Australia Day, Good Friday, Easter Monday |
Regional holidays (US states, Scotland, Canadian provinces, Australian states) are not included. Count with your own holidays.
Constitution Day countdown questions
How many days until Constitution Day including today?
336. Today, Saturday, October 17, is the first of them; the 335 at the top starts from tomorrow. In weeks that's 47 weeks and 6 days, and from midnight tonight it's 8,040 hours.
What day is Constitution Day 2027?
Friday, September 17, 2027. In 2028 it's Sunday, September 17.
Is Constitution Day 2027 a holiday?
No, not a US federal holiday. It's a Friday, so banks, offices and schools keep normal hours.
Countdown milestones to Constitution Day
The Constitution Day countdown reaches 200 days on Monday, March 1, 2027 and gets down to 1 day on Thursday, September 16, 2027.
| Countdown | Date |
|---|---|
| 200 days to go | Monday, March 1, 2027 |
| 100 days to go | Wednesday, June 9, 2027 |
| 75 days to go | Sunday, July 4, 2027 |
| 50 days to go | Thursday, July 29, 2027 |
| 30 days to go | Wednesday, August 18, 2027 |
| 14 days to go | Friday, September 3, 2027 |
| 7 days to go | Friday, September 10, 2027 |
| 1 day to go | Thursday, September 16, 2027 |
Days until Constitution Day from other dates
Start the count later and the number shrinks. A week from today, on Sat, Oct 24, there will be 328 days to go until Constitution Day (Sep 17).
| Counting from | Days until Constitution Day | Weeks and days |
|---|---|---|
| Sunday, October 18, 2026 | 334 days | 47 weeks, 5 days |
| Saturday, October 24, 2026 | 328 days | 46 weeks, 6 days |
| Saturday, October 31, 2026 | 321 days | 45 weeks, 6 days |
| Sunday, November 1, 2026 | 320 days | 45 weeks, 5 days |
| Tuesday, December 1, 2026 | 290 days | 41 weeks, 3 days |
| Friday, January 1, 2027 | 259 days | 37 weeks |
| Monday, February 1, 2027 | 228 days | 32 weeks, 4 days |
| Monday, March 1, 2027 | 200 days | 28 weeks, 4 days |
| Thursday, April 1, 2027 | 169 days | 24 weeks, 1 day |
September 2027
Constitution Day 2027 facts
| Date | Friday, September 17, 2027 |
|---|---|
| Day of the week | Friday |
| Day of the year | Day 260 of 365 |
| ISO week | Week 37 |
| Leap year | 2027 is not a leap year |
| Quarter | Q3 2027 |
| Written as | 09/17/2027 (US), 17/09/2027 (UK), 2027-09-17 (ISO) |
| Moon phase | Waning gibbous (UTC) |
| The one after | Sunday, September 17, 2028 |
| Last time | Thursday, September 17, 2026, 30 days ago |
How this is calculated
Each midnight takes one off the number. Today is left out and the day itself is counted, so tomorrow shows as 1 day away. Clock changes for daylight saving make no difference.
In Excel or Google Sheets, type =DATE(2027,9,17)-TODAY() into a cell to get the same count; add 1 to include today.
Counted from Saturday, October 17, 2026 (US Eastern time). When you open the page, it counts again from the date on your device, so it matches your own day.
Related countdowns
Cite this page
APA: ClockTotals. (2026, October 17). How Many Days Until Constitution Day 2027? https://clocktotals.com/days-until/constitution-day/
MLA: “How Many Days Until Constitution Day 2027?” ClockTotals, 17 Oct. 2026, clocktotals.com/days-until/constitution-day/.
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