Count or add working days with a custom weekly schedule, selected OPM-observed U.S. federal holidays, and configurable work hours per day.
A quick decision brief for this specific tool
Range or add mode, valid date(s), whole workday count, custom seven-day work schedule, selected U.S. federal holidays, and work hours per counted day
Working-day total or target date, calendar dates traversed, mutually exclusive holiday/schedule exclusions, and work-hour total
UTC-stable date-only iteration; range mode includes both endpoints, while add mode treats the start as day zero and begins on the following date
Choose your path
Count an inclusive custom work schedule or add whole working days after a start date using mutually exclusive schedule and selected-holiday exclusions.
Count both endpoints under a real weekly schedule.
Use range mode, select workweek/holidays, set hours per day, and inspect the classification totals.
Every date reconciles once as working, selected holiday, or non-working schedule date.
Find the date N workdays after receipt without counting receipt as day one.
Use add mode from the receipt date and inspect dates traversed and exclusions.
Starting Sunday 2026-08-23 plus 10 standard workdays returns Friday 2026-09-04 and labels the start as day zero.
Model a sparse or weekend-inclusive workweek without an iteration failure.
Toggle the seven-day schedule and selected federal dates, then review result and hours.
A valid sparse schedule completes, while zero selected workdays is explicitly rejected.
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Add or subtract bounded whole calendar days from an exact Gregorian date without local-time shifts, hidden today defaults, or business-day assumptions.
Range mode is inclusive. Add mode excludes the starting date and iterates forward from the following date.
Target = first date after start that completes N eligible workdaysDates are parsed and advanced as UTC calendar days, so daylight-saving transitions do not change a count.
Selected federal holidays follow OPM names and standard Monday–Friday observation. Work hours equal counted days times the user-entered hours/day and are not a payroll determination.
Updated: July 2026
A project manager counts an inclusive delivery window using the team's actual weekly schedule and selected federal dates.
An operations user adds ten working days after receipt, with the receipt date explicitly treated as day zero.
An HR coordinator runs an initial schedule estimate, then verifies employer policy and non-federal closures before acting.
Use range mode for an inclusive schedule count or add mode to find a target date after a whole number of working days. Customize the seven-day workweek, federal exclusions, and hours per counted day.