There are 20 business days in September 2028. That is 21 weekdays minus 1 US federal holiday falling on a weekday in the month. September 2028 starts on a Friday and ends on a Saturday. This page gives the exact count, the day-by-day calendar, and how the count is worked out.
Try the tool: Business Days Calculator — count the business days for any month or date range, with your own holidays added.
How many business days in September 2028?
| Count | Value |
|---|---|
| Total days in the month | 30 |
| Weekdays (Monday–Friday) | 21 |
| Weekend days (Saturday–Sunday) | 9 |
| US federal holidays on weekdays | 1 |
| Business days | 20 |
The federal holidays in September 2028 are Labor Day (4 September). 1 of them fall on a weekday and are subtracted from the weekday count; the rest fall on a weekend and cost no business days. Business days are counted here as weekdays minus US federal holidays — if your employer observes different holidays, add them in the business days calculator, which lets you add your own holidays.
The distinction matters: "business days" and "working days" are often used interchangeably, but they are not the same. Working days are the weekdays — Monday to Friday — and there are 21 of them in September 2028. Business days are the working days minus the public holidays, and there are 20 of them. A deadline of "10 business days" and a deadline of "10 working days" can therefore differ by a day or two, and the difference is the holidays.
Day-by-day calendar — September 2028
| Date | Day of the week | Business day? |
|---|---|---|
| 1 September 2028 | Friday | Yes |
| 2 September 2028 | Saturday | No — weekend |
| 3 September 2028 | Sunday | No — weekend |
| 4 September 2028 | Monday | No — Labor Day |
| 5 September 2028 | Tuesday | Yes |
| 6 September 2028 | Wednesday | Yes |
| 7 September 2028 | Thursday | Yes |
| 8 September 2028 | Friday | Yes |
| 9 September 2028 | Saturday | No — weekend |
| 10 September 2028 | Sunday | No — weekend |
| 11 September 2028 | Monday | Yes |
| 12 September 2028 | Tuesday | Yes |
| 13 September 2028 | Wednesday | Yes |
| 14 September 2028 | Thursday | Yes |
| 15 September 2028 | Friday | Yes |
| 16 September 2028 | Saturday | No — weekend |
| 17 September 2028 | Sunday | No — weekend |
| 18 September 2028 | Monday | Yes |
| 19 September 2028 | Tuesday | Yes |
| 20 September 2028 | Wednesday | Yes |
| 21 September 2028 | Thursday | Yes |
| 22 September 2028 | Friday | Yes |
| 23 September 2028 | Saturday | No — weekend |
| 24 September 2028 | Sunday | No — weekend |
| 25 September 2028 | Monday | Yes |
| 26 September 2028 | Tuesday | Yes |
| 27 September 2028 | Wednesday | Yes |
| 28 September 2028 | Thursday | Yes |
| 29 September 2028 | Friday | Yes |
| 30 September 2028 | Saturday | No — weekend |
Working weeks in September 2028
The working weeks of the month — Monday to Friday, with the business days in each week:
| Week starting | Days | Business days |
|---|---|---|
| 28 August 2028 | 1 September 2028 – 1 September 2028 | 1 |
| 4 September 2028 | 4 September 2028 – 8 September 2028 | 4 |
| 11 September 2028 | 11 September 2028 – 15 September 2028 | 5 |
| 18 September 2028 | 18 September 2028 – 22 September 2028 | 5 |
| 25 September 2028 | 25 September 2028 – 29 September 2028 | 5 |
How the count is worked out
Step one: count the days in the month — 30 for September 2028. Step two: count the weekends. September 2028 starts on a Friday, so the Saturdays and Sundays fall on the dates shown in the table — 9 weekend days in total, leaving 21 weekdays. Step three: subtract the public holidays that fall on weekdays. In September 2028 that is 1 day, leaving 20 business days. The days between dates calculator does the same calculation for any date range, and the date calculator works out what date it is a number of days from now.
September in other years in other years
The same month in the adjacent years, for comparison — the number changes because the calendar shifts by one day each year (two after a leap year), so the same month starts on a different weekday.
| Year | Total days | Weekdays | Weekends | Business days |
|---|---|---|---|---|
| 2027 | 30 | 22 | 8 | 21 |
| 2028 | 30 | 21 | 9 | 20 |
| 2029 | 30 | 20 | 10 | 19 |
September 2028 in the year
September is the 9th month of 2028 — the 3rd quarter of the year (Q3). There are 244 days in the year before September begins, and 92 days left in the year after it ends. In the Northern Hemisphere it is autumn; in the Southern Hemisphere the seasons are reversed. 2028 is a leap year, with 366 days.
The federal holidays still to come after September 2028 are Columbus Day (9 October 2028), Veterans Day (11 November 2028), Thanksgiving Day (23 November 2028), Christmas Day (25 December 2028). If you are planning the rest of the year, those are the days to watch: each one that falls on a weekday costs a business day, and each one that falls near a weekend tends to become a long weekend. The days between dates calculator counts the days to any of them, and the holiday countdowns show the countdown to each one live.
Planning with September 2028
20 business days is 4 working weeks. If you are planning a project, a deadline or a holiday, that is the capacity of the month: 20 days on which offices, banks and government departments are open. The weekends — 9 days — are the days off, and the federal holidays are the days to check before you promise a delivery date. For the same month last year, see business days in september 2027.
Frequently asked questions
How many business days are there in September 2028?
20 — 21 weekdays minus 1 federal holiday on weekdays.
How many weekdays are in September 2028?
21 weekdays and 9 weekend days, out of 30 days in total.
What day of the week does September 2028 start on?
September 2028 starts on a Friday and ends on a Saturday.
How many business days are there in September 2027?
See business days in september 2027 for the exact count — it differs because the calendar shifts by a day each year.
How many hours are there in September 2028?
720 hours — 43200 minutes, or 2592000 seconds. That is the total for the whole month, including the nights and weekends; the working hours are 168 for a standard eight-hour day, or 160 if you count business days only.
How do you count business days?
Count the weekdays in the range and subtract the public holidays that fall on weekdays. The business days calculator does it for any range, with your own holidays added.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - US federal holiday rules (5 U.S.C. § 6103): the holidays subtracted in the business day count are the eleven federal holidays, on the dates set by law.
- TimeFlow's business days calculator and days between dates calculator — the live tools behind the counts on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.