The due date that is N calendar days, business days, weeks, or months after a start date, with weekend and holiday deadlines rolled to the next business day.
| Term | Raw date | Deadline | Weekday | Days from start |
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This deadline calculator turns a start date and a term such as 30 days, 10 business days, 6 weeks, or 3 months into a concrete due date with its weekday. It can roll a deadline that lands on a Saturday, Sunday, or US federal holiday forward to the next business day, tells you how many days away the result is from today, and lists the due dates for common terms (7, 10, 14, 21, 30, 45, 60, and 90) side by side. It is meant for invoice and payment terms, contract notice periods, response windows, project milestones, return policies, and anyone who needs to know exactly which day a countable period ends.
Calendar days add N to the start date with automatic month and year rollover. Weeks add 7N days. Months move the month number and clamp to the last day when the target month is shorter (January 31 plus one month is February 28). Business days step one day at a time, skipping Saturdays, Sundays, and the eleven US federal holidays on their observed dates (Saturday holidays observed Friday, Sunday holidays observed Monday). The optional roll rule moves a non-business-day result forward to the next business day. Dates are handled as local calendar dates, so daylight saving changes never shift a result by a day.
By default no: the start date is day zero and a 30-day deadline is the date 30 days later, which is how most payment terms and contract clauses are read. Tick the option to count the start date as day one if your rule says the period begins on the start date itself; that shifts every result one day earlier.
With the roll option on, a deadline that lands on a Saturday, Sunday, or observed US federal holiday moves forward to the next business day, which is the convention in most commercial contracts and in the US Federal Rules of Civil Procedure. Turn it off to see the raw calendar result. When you count backward with a negative number, the roll goes to the previous business day instead.
Not always. Court rules, tax filing rules, and statutes each have their own counting conventions: some exclude the trigger day, some count only business days for short periods, some add mailing days, and each follows its own holiday list. Use this tool as a general calculator and confirm any legal or tax deadline against the governing rule.
The tool keeps the same day of the month when it exists and otherwise uses the last day of the target month. Three months after November 30 is February 28 (or 29 in a leap year), and one month after January 31 is February 28. This matches the behavior of most spreadsheet EDATE functions.
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