Skip to content
Zeitwide
Sign inGet API key

Is Sunday 12 September 2027 a US federal holidays business day?

No: Sunday 12 September 2027 is not a US federal holidays business day, because US federal holidays is closed at weekends; US federal holidays reopens on Monday 13 September 2027 (Zeitwide release 2026.11.03.1).

28 days of US federal holidays around Sun 12 Sept 2027

US federal holidays, Sun 5 Sept 2027 to Sat 2 Oct 2027
CalendarSun 5 Sept 2027Mon 6 Sept 2027Tue 7 Sept 2027Wed 8 Sept 2027Thu 9 Sept 2027Fri 10 Sept 2027Sat 11 Sept 2027Sun 12 Sept 2027Mon 13 Sept 2027Tue 14 Sept 2027Wed 15 Sept 2027Thu 16 Sept 2027Fri 17 Sept 2027Sat 18 Sept 2027Sun 19 Sept 2027Mon 20 Sept 2027Tue 21 Sept 2027Wed 22 Sept 2027Thu 23 Sept 2027Fri 24 Sept 2027Sat 25 Sept 2027Sun 26 Sept 2027Mon 27 Sept 2027Tue 28 Sept 2027Wed 29 Sept 2027Thu 30 Sept 2027Fri 1 Oct 2027Sat 2 Oct 2027
US federal holidaysUS federal holidays closed for the weekend Sun 5 Sept 2027US federal holidays closed Mon 6 Sept 2027: Labor DayUS federal holidays open Tue 7 Sept 2027US federal holidays open Wed 8 Sept 2027US federal holidays open Thu 9 Sept 2027US federal holidays open Fri 10 Sept 2027US federal holidays closed for the weekend Sat 11 Sept 2027US federal holidays closed for the weekend Sun 12 Sept 2027US federal holidays open Mon 13 Sept 2027US federal holidays open Tue 14 Sept 2027US federal holidays open Wed 15 Sept 2027US federal holidays open Thu 16 Sept 2027US federal holidays open Fri 17 Sept 2027US federal holidays closed for the weekend Sat 18 Sept 2027US federal holidays closed for the weekend Sun 19 Sept 2027US federal holidays open Mon 20 Sept 2027US federal holidays open Tue 21 Sept 2027US federal holidays open Wed 22 Sept 2027US federal holidays open Thu 23 Sept 2027US federal holidays open Fri 24 Sept 2027US federal holidays closed for the weekend Sat 25 Sept 2027US federal holidays closed for the weekend Sun 26 Sept 2027US federal holidays open Mon 27 Sept 2027US federal holidays open Tue 28 Sept 2027US federal holidays open Wed 29 Sept 2027US federal holidays open Thu 30 Sept 2027US federal holidays open Fri 1 Oct 2027US federal holidays closed for the weekend Sat 2 Oct 2027
  • Open
  • Closed
  • Weekend
  • Holiday on a weekend

Other calendars on Sun 12 Sept 2027

Sunday 12 September 2027 on 7 other calendars
CalendarStatusWhy
Germany: nationwide public holidays (DE)Germany: nationwide public holidays closed for the weekend Sun 12 Sept 2027Weekend
T2 (TARGET RTGS) (EU-T2)T2 (TARGET RTGS) closed for the weekend Sun 12 Sept 2027Weekend
CHAPS (GB-CHAPS)CHAPS closed for the weekend Sun 12 Sept 2027Weekend
England and Wales bank holidays (GB-EAW)England and Wales bank holidays closed for the weekend Sun 12 Sept 2027Weekend
FedACH Services (US-FEDACH)FedACH Services closed for the weekend Sun 12 Sept 2027Weekend
FedNow Service (US-FEDNOW)FedNow Service open Sun 12 Sept 2027Business day
Fedwire Funds Service (US-FEDWIRE)Fedwire Funds Service closed for the weekend Sun 12 Sept 2027Weekend

Sources

No entry decides this date, so US federal holidays's weekend rule does. US federal holidays is closed every Saturday and Sunday.

Zeitwide release 2026.11.03.1. Evidence and signed receipt for US federal holidays on Sun 12 Sept 2027

Cite this answer
Zeitwide (2026). US-FEDERAL on 2027-09-12. Release 2026.11.03.1. https://zeitwide.com/calendars/US-FEDERAL/2027-09-12

Questions people ask

When does US federal holidays reopen after Sunday 12 September 2027?

US federal holidays reopens on Monday 13 September 2027.

Which days is US federal holidays closed?

US federal holidays is closed every Saturday and Sunday. It also closes on the holidays published by U.S. Office of Personnel Management.

Where does this answer come from?

The calendar's weekend rule and no closure for it in U.S. Office of Personnel Management, in Zeitwide release 2026.11.03.1.

The same answer from the API

curl https://api.zeitwide.com/v1/calendars/US-FEDERAL/days/2027-09-12

{
  "date": "2027-09-12",
  "is_business_day": false,
  "dataset_release": "2026.11.03.1"
}

Agents get it from the is_business_day MCP tool. The developer quickstart covers keys, MCP and webhooks