September 12, 2027 falls on a Sunday
September 12, 2027 is a Sunday. It is 354 days from today, September 23, 2026. The date is day 255 of 365 in 2027, it sits in ISO week 36, and it is the 12th of a 30-day month with 18 days after it.
What day of the week is September 12?
In 2027 it is a Sunday. The weekday is not a property of the date itself, it is a property of the date in a given year, so the honest answer always names the year. A common year is 365 days, which is 52 weeks plus one spare day, so a fixed date moves forward one weekday from one year to the next. A leap year inserts a second spare day, so the step is two whenever 29 February falls inside the gap. That is why September 12 works its way around the week rather than repeating on a tidy schedule.
September 12 in the next few years
| Year | Weekday | Day of year | ISO week | Leap year |
|---|---|---|---|---|
| 2026 | Saturday | 255 | 37 | no |
| 2027 | Sunday | 255 | 36 | no |
| 2028 | Tuesday | 256 | 37 | yes |
| 2029 | Wednesday | 255 | 37 | no |
| 2030 | Thursday | 255 | 37 | no |
| 2031 | Friday | 255 | 37 | no |
| 2032 | Sunday | 256 | 37 | yes |
| 2033 | Monday | 255 | 37 | no |
Between 2026 and 2027 the weekday moves from Saturday to Sunday, a step of 1. The day-of-year column also moves: September 12 is day 255 in a common year and day 256 in a leap year, because it sits after 29 February.
How often does September 12 fall at a weekend?
Counting the 28 occurrences from 2027 to 2054, September 12 lands on a Saturday 4 times and on a Sunday 4 times, so 8 of those 28 years put it at a weekend. Over a full 28-year stretch the Gregorian calendar repeats itself, and a fixed date visits each weekday four times, so the long-run answer is two weekend years in every seven.
Where September 12 sits in the calendar
September 12 is the 12th day of September, a month of 30 days in 2027, leaving 18 days of the month after it. Measured from 1 January it is 254 days into the year, and 110 days remain to 31 December, which puts it 69.9% of the way through 2027. In September 2027 the other Sundays are the 5th, 19th, 26th, because weekdays repeat every seven days inside a month just as they do across one.
What else happens around September 12?
| Date | Occasion | Type | Days from September 12 |
|---|---|---|---|
| September 11 | Patriot Day | observance | 1 before |
How far away is September 12?
The next September 12 is Sunday, September 12, 2027, 354 days from today. That is 50 whole weeks and 4 days, or 50.6 weeks written as a decimal. To count towards it second by second, use the date calculator.
Questions
- What day of the week is September 12, 2027?
- A Sunday. It is day 255 of 365 and falls in ISO week 36.
- What day of the week is September 12 next year?
- In 2027 it is a Sunday.
- What number day of the year is September 12?
- Day 255 in a common year and day 256 in a leap year. See day 255 for more.
- Which week of the year is September 12 in?
- ISO week 36 in 2027. The week 36 page lists every date in it.
Nearby dates
The 12th of other months
All 366 dates · Week 36 · Day 255 of the year · Event countdowns · When is it? · Date calculator