U.S. observance
How Many Days Until U.S. Air Force Birthday 2027?
Today: · Eastern Time (America/New_York)
Calendar days until U.S. Air Force Birthday
329 days until U.S. Air Force Birthday
U.S. Air Force Birthday is on Saturday, September 18, 2027.
Live countdown to midnight on September 18, 2027
328 days, 17 hours, 27 minutes, 1 second remaining
Eastern Time (America/New_York). Countdown days are 24 hours; the calendar-day count above uses local dates.
- Calendar days (signed)
- 329
- Full weeks + days
- 47 weeks + 0 days
- Calendar months + days
- 10 months + 25 days
- Years, months, days
- 0 years, 10 months, 25 days
- Weekdays counted
- 235
- Weekend days counted
- 94
- U.S. business days
- 225
- Observed holiday dates skipped
- 10
What is U.S. Air Force Birthday?
The U.S. Air Force Birthday, September 18, marks the creation of the Air Force as a separate branch of the armed forces.
History of U.S. Air Force Birthday
Military aviation began in 1907 with the Aeronautical Division of the U.S. Army Signal Corps and grew into the Army Air Forces during World War II. The National Security Act of 1947 made the Air Force an independent service, effective September 18, 1947.
U.S. Air Force Birthday today
Bases and airmen mark the anniversary with ceremonies, and the Air Force Ball season is held around the date.
Date details
- Category
- U.S. observance
- How the date is set
- Same date every year
- Country / region
- United States
- Actual event date
Source: U.S. Air Force
Event date facts
- Weekday
- Saturday
- ISO week / year
- 37 / 2027
- Day of year
- 261
- Quarter
- 3
- Days left in year
- 104
- 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 | Thursday, September 18, 2025 | — | Same date every year |
| 2026 | Friday, September 18, 2026 | — | Same date every year |
| 2027 | Saturday, September 18, 2027 | — | Same date every year |
| 2028 | Monday, September 18, 2028 | — | Same date every year |
| 2029 | Tuesday, September 18, 2029 | — | Same date every year |
Quick answers
- What day of the week is September 18, 2027?
- September 18, 2027 is a Saturday.
- Is U.S. Air Force Birthday a federal holiday?
- No. U.S. Air Force Birthday is not a U.S. federal holiday, so federal offices and most businesses stay open.
- What week of the year is September 18, 2027?
- September 18, 2027 is in ISO week 37 of 2027 and is day 261 of the year.
How the U.S. Air Force Birthday date is calculated
- U.S. Air Force Birthday is on September 18 every year. In 2027 that is a Saturday.
- The countdown counts calendar days from today to September 18, 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 18, 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 6:32 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.