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Is Sunday 17 December 2028 a US federal holidays business day?

No: Sunday 17 December 2028 is not a US federal holidays business day, because US federal holidays is closed at weekends; US federal holidays reopens on Monday 18 December 2028 (Zeitwide release 2026.11.04.1).

28 days of US federal holidays around Sun 17 Dec 2028

US federal holidays, Sun 10 Dec 2028 to Sat 6 Jan 2029
CalendarSun 10 Dec 2028Mon 11 Dec 2028Tue 12 Dec 2028Wed 13 Dec 2028Thu 14 Dec 2028Fri 15 Dec 2028Sat 16 Dec 2028Sun 17 Dec 2028Mon 18 Dec 2028Tue 19 Dec 2028Wed 20 Dec 2028Thu 21 Dec 2028Fri 22 Dec 2028Sat 23 Dec 2028Sun 24 Dec 2028Mon 25 Dec 2028Tue 26 Dec 2028Wed 27 Dec 2028Thu 28 Dec 2028Fri 29 Dec 2028Sat 30 Dec 2028Sun 31 Dec 2028Mon 1 Jan 2029Tue 2 Jan 2029Wed 3 Jan 2029Thu 4 Jan 2029Fri 5 Jan 2029Sat 6 Jan 2029
US federal holidaysUS federal holidays closed for the weekend Sun 10 Dec 2028US federal holidays open Mon 11 Dec 2028US federal holidays open Tue 12 Dec 2028US federal holidays open Wed 13 Dec 2028US federal holidays open Thu 14 Dec 2028US federal holidays open Fri 15 Dec 2028US federal holidays closed for the weekend Sat 16 Dec 2028US federal holidays closed for the weekend Sun 17 Dec 2028US federal holidays open Mon 18 Dec 2028US federal holidays open Tue 19 Dec 2028US federal holidays open Wed 20 Dec 2028US federal holidays open Thu 21 Dec 2028US federal holidays open Fri 22 Dec 2028US federal holidays closed for the weekend Sat 23 Dec 2028US federal holidays closed for the weekend Sun 24 Dec 2028US federal holidays closed Mon 25 Dec 2028: Christmas DayUS federal holidays open Tue 26 Dec 2028US federal holidays open Wed 27 Dec 2028US federal holidays open Thu 28 Dec 2028US federal holidays open Fri 29 Dec 2028US federal holidays closed for the weekend Sat 30 Dec 2028US federal holidays closed for the weekend Sun 31 Dec 2028US federal holidays closed Mon 1 Jan 2029: New Year's DayUS federal holidays open Tue 2 Jan 2029US federal holidays open Wed 3 Jan 2029US federal holidays open Thu 4 Jan 2029US federal holidays open Fri 5 Jan 2029US federal holidays closed for the weekend Sat 6 Jan 2029
  • Open
  • Closed
  • Weekend
  • Holiday on a weekend

Other calendars on Sun 17 Dec 2028

Sunday 17 December 2028 on 7 other calendars
CalendarStatusWhy
Germany: nationwide public holidays (DE)No dataOutside this calendar's sources
T2 (TARGET RTGS) (EU-T2)T2 (TARGET RTGS) closed for the weekend Sun 17 Dec 2028Weekend
CHAPS (GB-CHAPS)CHAPS closed for the weekend Sun 17 Dec 2028Weekend
England and Wales bank holidays (GB-EAW)England and Wales bank holidays closed for the weekend Sun 17 Dec 2028Weekend
FedACH Services (US-FEDACH)FedACH Services closed for the weekend Sun 17 Dec 2028Weekend
FedNow Service (US-FEDNOW)FedNow Service open Sun 17 Dec 2028Business day
Fedwire Funds Service (US-FEDWIRE)Fedwire Funds Service closed for the weekend Sun 17 Dec 2028Weekend

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 2026.11.04.1. Evidence and signed receipt for US federal holidays on Sun 17 Dec 2028

US federal holidays revision 44, published .

Cite this answer
Zeitwide (2026). US-FEDERAL on 2028-12-17. Release 2026.11.04.1. https://zeitwide.com/calendars/US-FEDERAL/2028-12-17

Questions people ask

When does US federal holidays reopen after Sunday 17 December 2028?

US federal holidays reopens on Monday 18 December 2028.

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 2026.11.04.1.

The same answer from the API

curl https://api.zeitwide.com/v1/calendars/US-FEDERAL/days/2028-12-17

{
  "date": "2028-12-17",
  "is_business_day": false,
  "dataset_release": "2026.11.04.1"
}

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