Deadline Calculator

Background.

A deadline is not a date plus a number of days. Almost every rule that sets one adds two steps that plain date arithmetic skips: the day of the triggering event is not counted, and if the last day of the period lands on a weekend or a public holiday, the period keeps running until the next day that is not. Skip either step and you get a date that looks right and is wrong — and in the direction that loses you the deadline rather than gaining you time.

This calculator applies both. Give it the trigger date — the day of service, filing, notice, signature or delivery — and the length of the period, and it returns the day the clock actually runs out, the raw date before the roll so you can see what the roll did, how many days it moved, and how many weekend days and federal holidays sat inside the span.

The calendar-day method implements the convention in Rule 6(a) of the Federal Rules of Civil Procedure, which is the clearest published statement of a rule used far beyond federal civil litigation: exclude the day of the event that triggers the period; count every day, including intermediate Saturdays, Sundays and legal holidays; include the last day, but if the last day is a Saturday, Sunday or legal holiday, the period continues to run until the end of the next day that is none of those. The direction selector matters because the roll reverses with it: Rule 6(a)(5) continues counting forward for a period measured after an event and backward for one measured before it, so a notice period that must precede a hearing rolls earlier, not later. The identically worded Rule 26(a) of the Federal Rules of Appellate Procedure confirms the same convention in a separate rule set.

The working-day method is the other thing people mean by a deadline — count only days that are not a weekend or holiday. It is what most contracts intend by "business days", and it is deliberately labelled as a different method rather than blended in, because the two produce different dates from the same inputs and the governing rule decides which one applies.

The holiday list is the eleven US federal legal public holidays named in 5 U.S.C. § 6103, computed from their statutory rules rather than typed in per year, with the weekend-observance shift applied to the five fixed-date holidays. Two limits are stated beside the result rather than buried: state holidays are not included, even though Rule 6(a)(6)(C) makes them count for a forward-measured period, because there are fifty different lists and a partial one would be worse than none; and periods stated in hours are not implemented. None of this is legal advice. Local court rules, state analogues of Rule 6, statutes of limitations and contract terms routinely count differently, and any date that matters should be confirmed against the governing rule and by the licensed professional responsible for the filing.

What is deadline calculator?

A deadline computation has three parts: where the period starts, how its days are counted, and what happens when the last day is not a day you can act on. The first is a convention — under Rule 6(a)(1)(A) the trigger day is excluded, so a three-day period beginning on a Monday ends on Thursday, not Wednesday. The second is the choice between calendar days and working days. The third is the roll, and it is the part that plain arithmetic and general-purpose date calculators leave out.

The roll is not a courtesy. Rule 6(a)(1)(C) says the period "continues to run until the end of the next day that is not a Saturday, Sunday, or legal holiday", which means the deadline genuinely is the later date. Rule 6(a)(5) then makes the direction of that continuation depend on which side of the event the period sits: forward after it, backward before it.

A legal holiday for these purposes is one of the days 5 U.S.C. § 6103 names, any day declared a holiday by the President or Congress, and — for a forward-measured period only — a holiday of the state where the court sits. This page covers the first category. It does not cover the third, and says so beside the answer.

How to use this calculator.

1. 01Enter the trigger date: the day the event happened, not the day after. The calculator excludes it from the count for you, per Rule 6(a)(1)(A).
2. 02Enter the length of the period as a positive whole number of days, then set the direction — 'measured after the event' for a response or filing window, 'measured before the event' for a notice period that must precede something.
3. 03Choose the counting method from the governing rule, not from habit. Court rules and most statutes count calendar days and roll the last day; contracts that say 'business days' usually mean working days. If the rule is ambiguous, run it both ways and use the earlier date.
4. 04Leave holidays on the federal setting unless your rule genuinely recognises weekends only. Switch it to compare — the federal holidays in the span are reported either way.
5. 05Read 'before the roll' next to the deadline. If those two dates differ, a general date calculator would have handed you the earlier one.
6. 06Read the rule note beneath the result before you rely on any date. It names the subparagraph applied and what this page does not cover, including state holidays and hour-based periods.

The formula.

In calendar-day mode the raw last day is the trigger date shifted by the whole period — forward or backward — with no days skipped, because Rule 6(a)(1)(B) counts every day including intermediate Saturdays, Sundays and legal holidays. The trigger day itself is excluded by Rule 6(a)(1)(A), which is what makes the shift a plain addition rather than an addition minus one. Then Rule 6(a)(1)(C) applies: while the candidate day is a Saturday, a Sunday or a legal holiday, step one more day in the direction the period is measured, and stop at the first day that is none of those.

In working-day mode the walk itself does the filtering: step one calendar day at a time from the trigger date and decrement the counter only on days that are not blocked. The result is already an available day, so the roll is a no-op — except for a zero-day period, where the roll is what moves a trigger date that falls on a weekend onto a day you can act on.

The holiday calendar is derived, not stored. Five holidays are fixed dates — New Year's Day, Juneteenth, Independence Day, Veterans Day and Christmas — and take the observance shift when they fall at a weekend: Saturday moves to the Friday before, Sunday to the Monday after. The other six are pinned to a weekday by rule (the third Monday in January, the third Monday in February, the last Monday in May, the first Monday in September, the second Monday in October, the fourth Thursday in November) and so can never fall at a weekend. One consequence is easy to miss: when 1 January falls on a Saturday, the observed holiday is 31 December of the previous year, so the calendar scan has to look a year either side of the span.

Every date is anchored at UTC midnight, so no daylight-saving transition can add or remove a day, and the descriptive weekend and holiday counts are taken over the half-open span from the earlier date to the later one — the same convention the date difference and add-days calculators use, so the three pages cannot disagree about the same span.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Federal Rules of Civil Procedure, Rule 6 — "Computing and Extending Time; Time for Motion Papers", subdivision (a) "Computing Time", via the Legal Information Institute. The source of the counting convention implemented here, quoted verbatim: 6(a)(1)(A) "exclude the day of the event that triggers the period"; 6(a)(1)(B) "count every day, including intermediate Saturdays, Sundays, and legal holidays"; 6(a)(1)(C) "include the last day of the period, but if the last day is a Saturday, Sunday, or legal holiday, the period continues to run until the end of the next day that is not a Saturday, Sunday, or legal holiday"; 6(a)(5) the "next day" is found "by continuing to count forward when the period is measured after an event and backward when measured before an event"; 6(a)(6) defines legal holiday. The time-computation rules take their present form from the 2009 amendments, which removed the former special treatment of periods shorter than 11 days.
2. [2]5 U.S. Code § 6103 — "Holidays", via the Legal Information Institute. Subsection (a) names the eleven legal public holidays and the rule that fixes each one: New Year's Day January 1; birthday of Martin Luther King, Jr. the third Monday in January; Washington's Birthday the third Monday in February; Memorial Day the last Monday in May; Juneteenth National Independence Day June 19; Independence Day July 4; Labor Day the first Monday in September; Columbus Day the second Monday in October; Veterans Day November 11; Thanksgiving Day the fourth Thursday in November; Christmas Day December 25. Subsection (b) supplies the weekend-observance rule, making the Friday immediately before a Saturday-falling holiday the legal public holiday for a Monday-to-Friday workweek. Juneteenth was added by Public Law 117-17 (2021). FRCP Rule 6(a)(6)(A) incorporates this list by reference.
3. [3]Federal Rules of Appellate Procedure, Rule 26 — "Computing and Extending Time", via the Legal Information Institute. Cited because it confirms the same convention in a separate rule set adopted through a separate process: Rule 26(a)(1)(A), (B) and (C) carry language identical to FRCP 6(a)(1), and Rule 26(a)(6) names the same eleven federal holidays. Rule 26(a)(4) also supplies the answer to a question this page deliberately does not: the moment the last day ends — midnight in the court's time zone for electronic filing, the latest delivery time for mail or a commercial carrier, and the close of the clerk's office otherwise.