Date Tools
Add/Subtract from Date
Add or subtract years, months, weeks, and/or days from a date. Enable business days to skip weekends and federal holidays.
How it works
Start from any date and move forward or backward by any combination of years, months, weeks, and days. The result shows the landing date, its day of the week, and the total calendar and business days traveled.
The business-days option changes how the days component is counted: instead of calendar days, it skips weekends and, if selected, federal holidays — including observed holidays, like a July 4th that falls on a Saturday and is observed Friday. Years, months, and weeks always move on the calendar; only the days component switches to business-day counting.
The federal holiday calendar covers all eleven federal holidays with their weekend-observation rules. State court holidays vary; if your deadline depends on a state holiday calendar, verify against the court's published list.
Worked example
Thirty days from June 11, 2026 is July 11, 2026 — a Saturday, which matters if something is due. Thirty business days excluding federal holidays lands on July 27, 2026, because the count skips twelve weekend days, Juneteenth (Friday, June 19), and the observed Independence Day holiday on Friday, July 3.
When to use it
Use it for deadline calculations, option and notice periods, and scheduling — any time an agreement or rule says “within N days” and you need the actual date, not an estimate.
Frequently asked questions
How are business days calculated?
Business days are weekdays — Monday through Friday — excluding, if you choose, federal holidays. When a federal holiday falls on a Saturday it is observed the preceding Friday; on a Sunday, the following Monday. The tool applies those observation rules automatically.
Which holidays does the calculator exclude?
The eleven U.S. federal holidays: New Year's Day, MLK Day, Presidents' Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas, each with weekend observation. It does not include state-specific court holidays — check those separately.
Can it calculate court deadlines?
It does the date arithmetic deadline rules require, including business-day counting. But deadline rules have their own conventions — when the clock starts, what happens when a deadline lands on a weekend, service additions — so apply the governing rule and use this to do the counting.