Paydays and work days · rules read October 11, 2026
Date calculator: add or subtract days
Pick a start date, a number and a unit (calendar days, weeks or business days) and get the resulting date.
Written by Radif Partners · How the hours are counted · Editorial policy
Resulting date
Thu, Jan 15, 2026
10 business days after Thu, Jan 1, 2026
| Calendar days between | 14 |
| Federal holidays in that span | 0 |
The start date is not counted; the first business day is the next one. How this is calculated.
Adding days to a date gives a different answer depending on the unit you count in, and this calculator handles all three. Two calendar days after December 23, 2026 is December 25, 2026, Christmas Day. Two business days after the same date is December 28, 2026, because the count skips the Friday holiday and the weekend that follows. Weeks are the simplest unit: six weeks after October 12, 2026 is November 23, 2026, always the same weekday as the start. In every mode the start date itself is not counted, so day one is the next calendar day or the next business day. Business days skip Saturdays, Sundays and the 11 federal holidays on the dates they are observed, such as July 3, 2026 for Independence Day. A negative number counts backwards, which is how a cutoff is set before a closing date: ten business days before December 31, 2026 is December 16, 2026.
One number, three ways to add it
2 business days later
December 28, 2026
| 2 calendar days later | December 25, 2026 (Fri, closed) |
| 2 weeks later | January 6, 2027 (Wed) |
“Closed” marks a weekend or an observed federal holiday.
Calendar days, weeks and business days compared
The three units diverge as soon as a weekend or a holiday sits in the way. Calendar days are a plain count on the calendar, weekends included. Weeks multiply by seven and land on the same weekday. Business days walk forward one weekday at a time and step over the observed federal holidays published by the Office of Personnel Management. The table runs each unit from real 2026 dates.
| Start | Added | Result | Note |
|---|---|---|---|
| December 23, 2026 | 2 calendar days | December 25, 2026 | lands on a holiday |
| December 23, 2026 | 2 business days | December 28, 2026 | skips the holiday and the weekend |
| October 12, 2026 | 30 calendar days | November 11, 2026 | Veterans Day |
| October 12, 2026 | 6 weeks | November 23, 2026 | same weekday |
| July 1, 2026 | 3 business days | July 7, 2026 | skips July 3, 2026 |
| July 1, 2026 | 3 weekdays, holidays ignored | July 6, 2026 | one day earlier |
| December 31, 2026 | minus 10 business days | December 16, 2026 | counted backwards |
The Independence Day row shows why the observed date matters. Independence Day itself is a Saturday in 2026, a day that would never count anyway; the federal day off is the Friday before. Three business days after July 1, 2026 is therefore July 7, 2026, while a tool that ignores holidays answers July 6, 2026.
Counting rules the calculator follows
The start date is day zero. Adding one calendar day to a Monday gives Tuesday; adding one business day to a Friday gives Monday, or Tuesday when the Monday is a holiday such as Labor Day. Subtracting works the same way in reverse. A result is never adjusted after the fact: if thirty calendar days lands on a Sunday, the result is that Sunday, which the mini calculator above marks as closed, and the page leaves the decision to the rule you are applying.
Counting backwards uses the same steps. Ten business days before December 31, 2026 is December 16, 2026: the count steps back over two weekends and over Christmas Day, so the result sits 15 calendar days before the target. A payroll team that needs time cards ten business days before a year-end payday would set December 16, 2026 as the cutoff, not December 21, 2026.
Holidays are the federal ones only. Private employers set their own holiday schedules, state governments add their own days, and banks follow yet another calendar, so a business-day result can be a day off for your office. The holiday switch in the calculator lets you treat federal holidays as workdays when your organization stays open. For the full list of observed dates in 2026 and 2027, see the federal holidays page.
Where a date calculation shows up at work
Typical uses are a start date set a number of days after an offer, the end of an introductory period, the date a leave request has to be filed by, or the last day to submit a time card before payroll closes. Each of those is set by a policy, a contract or a specific rule, and that text decides whether weekends count and whether day one is the start date. When the question is the gap between two known dates rather than a date to find, the days between dates calculator and the business days calculator do the reverse job. Overtime does not use any of these counts: the Department of Labor measures it per fixed workweek of 168 hours.