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Add US Federal Working Days

Adds or subtracts dates using the pinned OPM federal schedule and US weekend baseline.

When to use

You need a deterministic US federal employee/office date offset in 2026-2027.

Do not use when: You need state/local/private-employer, exchange or alternate-work-schedule semantics.

move one day at a time; decrement remaining only when US federal status.is_working_day=true

Skip the US weekend baseline and pinned OPM federal observed dates.

Parameter	Type	Unit	Required	Description
`start_date`	date		yes	Gregorian start date in 2026-2027.
`working_days`	integer		yes	Signed offset; start date is excluded for non-zero offsets. Range: ≥ -1000, ≤ 1000

Output	Type	Description
`start_date`	date	Input date.
`result_date`	date	Date reached.
`working_days_added`	integer	Signed requested offset.
`calendar_days_elapsed`	integer	Signed Gregorian difference.
`federal_holidays_skipped`	list	OPM federal holidays crossed.
`territory`	string	US.
`territory_name`	string	United States.
`day_type`	string	Regular weekday, regular weekend or OPM federal holiday.
`holiday_names`	string_list	OPM federal holiday names applying on the date.
`holiday_observed`	boolean	True when the date is the OPM in-lieu/observed date for a holiday whose actual date is a weekend.
`holiday_actual_dates`	string_list	Underlying statutory holiday dates for observed events.
`weekend_days`	string_list	CLDR Saturday/Sunday baseline.
`rest_day_policy`	string	OPM alternative work schedules need separate in-lieu resolution.
`calendar_scope`	string	Federal employees and federal offices only.
`calendar_profile`	string	us-opm-federal-holidays.
`source_quality`	string	Official OPM schedule and federal-law references.
`dataset_version`	string	Pinned OPM evidence package.
`sources`	list	Official OPM, federal guidance and legislation sources.

Offset across Juneteenth: {"start_date":"2027-06-17","working_days":1} → {"result_date":"2027-06-21"}

GET https://tttkmbb.com/api/v1/calculate/us-federal-add-working-days?start_date=2027-06-17&working_days=1

API: GET https://tttkmbb.com/api/v1/calculate/us-federal-add-working-days (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/us-federal-add-working-days · Markdown: https://tttkmbb.com/everyday/us-federal-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/us-federal-add-working-days.json
MCP: server https://tttkmbb.com/mcp, tool add_us_federal_working_days
OpenAPI operationId: add_us_federal_working_days
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

No. The default result uses the Monday-Friday baseline; OPM's alternate work-schedule rules require the employee's schedule.