September 2023 Calendar
September 2023 has 30 days, starting on a Friday and ending on a Saturday. It spans ISO weeks 35–39, with 21 weekdays and 9 weekend days — and 7 public holidays across the 12 countries listed below.
September 2023 month grid
September 2023
| W | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| 35 | 28 | 29 | 30 | 31 | 1 | 2 | 3 Clocks go forward: Chile |
| 36 | 4 Labour Day | 5 | 6 Last Quarter 22:21 UTC | 7 Independence Day | 8 | 9 | 10 |
| 37 | 11 | 12 | 13 | 14 | 15 New Moon 01:40 UTC | 16 Independence Day | 17 |
| 38 | 18 Respect-for-the-Aged Day | 19 | 20 | 21 | 22 First Quarter 19:32 UTC | 23 Autumnal Equinox Day · September equinox | 24 Heritage Day · Clocks go forward: New Zealand |
| 39 | 25 Public Holiday | 26 | 27 | 28 | 29 Full Moon 09:58 UTC | 30 | 1 |
| 40 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
12 public holiday 🌑 🌓 🌕 🌗 moon phase (UTC date) clock change / equinox W = ISO week
Public holidays in September 2023
| Date | Holiday | Observed in |
|---|---|---|
| Labour Day | US, Canada | |
| Independence Day | Brazil | |
| Independence Day | Mexico | |
| Respect-for-the-Aged Day | Japan | |
| Autumnal Equinox Day | Japan | |
| Heritage Day | South Africa | |
| Public Holiday | South Africa |
No national public holiday in September 2023 for the selected country.
National holidays only, from the open-source date-holidays dataset. States, provinces and regions add their own — see each country's holiday page for the full list and observances.
Moon phases
- Last Quarter
- New Moon
- First Quarter
- Full Moon
September equinox:
Times are shown in your time zone when JavaScript is on, UTC otherwise; near midnight the local date can differ. For moonrise and moonset see the moon pages for New York, London or Sydney.
Clock changes in September 2023
- Sunday, September 3 — clocks go forward in Chile (00:00 → 01:00)
- Sunday, September 24 — clocks go forward in New Zealand (02:00 → 03:00)
Local wall-clock times, from the IANA time zone database. How daylight saving time works.
September 2023 at a glance
- Days
- 30
- Weekdays
- 21
- Weekend days
- 9
- ISO weeks
- 35–39
- Day of year
- 244–273 of 365
- Quarter
- Q3
- Days left in 2023 after the 30th
- 92
- Friday the 13th
- No
The name: From the Latin septem, "seven": it was the seventh month of the early Roman calendar.
Working days by country
Monday–Friday minus national public holidays that fall on a weekday. Regional holidays are not subtracted.
Need a span that crosses months? Use the date and time calculator.
September 2023: common questions
How many working days are there in September 2023?
September 2023 has 21 weekdays (Monday to Friday) and 9 weekend days. In the United States, Labour Day (Mon, Sep 4) falls in the month, leaving 20 working days. The United Kingdom has no UK-wide bank holiday this month, so it has 21 working days (regional bank holidays in England, Scotland or Northern Ireland are not counted).
What week numbers are in September 2023?
September 2023 covers ISO weeks 35, 36, 37, 38, 39. ISO weeks start on Monday, so September 1, a Friday, falls in week 35.
When is the full moon in September 2023?
Friday, September 29 at 09:58 UTC. The new moon is on Friday, September 15.
Do the clocks change in September 2023?
On Sunday, September 3 clocks go forward one hour in Chile. On Sunday, September 24 clocks go forward one hour in New Zealand.
What day of the week does September 2023 start on?
September 2023 starts on a Friday and ends on a Saturday (the 30th). It runs from day 244 to day 273 of the year.