Response Deadline Calculator

Last reviewed: October 14, 2026

Calculate response deadlines for legal notices, HR grievance procedures, EEOC employment filings, contract response windows, and SLA obligations. Choose a common scenario or select from pre-loaded legal and HR windows in the dropdown.

The calculator counts calendar days or business days, lets you decide whether the trigger date is day 0 or day 1, and flags a deadline that lands on a weekend or public holiday together with the next business day.

Trigger / Notice Date

Response Window

Holiday Calendar

Count from day after trigger (Day 0 = trigger date)

For informational purposes only

This calculator provides general estimates based on business day counting rules. It does not constitute legal advice. Deadlines in legal, regulatory, or contractual matters may be subject to jurisdiction-specific rules, court orders, or statutory exceptions. Always verify critical deadlines with a qualified professional.

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Real-world example: federal civil answer deadline

A defendant in a US federal civil case who is served with the summons and complaint on Friday, May 22, 2026 must serve an answer within 21 days under FRCP Rule 12(a)(1)(A)(i). Rule 6(a)(1) sets the count: exclude the day of the event that triggers the period, count every day including intermediate Saturdays, Sundays and legal holidays, and include the last day, unless it is a Saturday, Sunday or legal holiday, in which case the period runs until the end of the next day that is none of those. Day 1 is Saturday, May 23 and day 21 is Friday, June 12, an ordinary weekday, so the answer is due June 12. Enter May 22, choose Custom with 21 calendar days and leave "count from day after" checked: the calculator gives the same date. Served one week later, on Friday, May 29, day 21 would be Juneteenth (Friday, June 19), a legal holiday, and the period would run to Monday, June 22; the calculator flags that day and shows the Monday. Rule 6(a)(6) defines a legal holiday as the federal holidays it lists, any day the President or Congress declares a holiday and, for periods measured after an event, any other day the state where the district court sits declares a holiday. The US calendar here holds the federal list only, so check state holidays yourself. HIPAA breach notice under 45 CFR 164.404(b) has another shape: without unreasonable delay and in no case later than 60 calendar days after discovery of the breach, so 60 days is an outer limit, not a target.

Common pitfalls in legal and HR response windows

Four mistakes are worth checking for. The first is mixing units: the EEOC counts its charge-filing limit in calendar days, weekends and holidays included, while the FMLA eligibility and designation notices in 29 CFR 825.300 are due within five business days, so moving from one matter to the other means switching modes. Next comes the trigger day. Rule 6(a)(1)(A) leaves it out, a contract may count it, and the difference is a full day; read the clause and set the "count from day after" box to match. Third, the holiday list: for periods measured after an event, Rule 6(a)(6) adds the state's holidays to the federal ones, and a calendar without them can show a deadline earlier than the rule allows. Last, service by mail. Under Rule 5(b)(2)(C) it is complete upon mailing, so the mailing date is the trigger, and Rule 6(d) then adds 3 days after the period would otherwise expire under Rule 6(a). The calculator does not add those 3 days for you.

HR teams can use the same calculator to check grievance and discipline windows. A collective agreement or HR policy sets its own periods and says whether it means calendar or business days, and the employer's holiday calendar may differ from the public holidays the calculator applies. Read the document, pick the country, and test the edge cases, such as a grievance filed on the Friday before a long weekend, where calendar and business-day counting give different deadlines.

Sources for these rules

Time Limits For Filing A Charge: 180 calendar days, extended to 300 where a state or local agency enforces a law on the same basis (for age, a state law and state agency); weekends and holidays count, a deadline on a weekend or holiday moves to the next business day (U.S. Equal Employment Opportunity Commission)
29 U.S.C. 626(f)(1)(F)-(G): at least 21 days to consider an ADEA waiver (45 days in a group termination program) and at least 7 days after signing to revoke it (U.S. Government Publishing Office (govinfo))
29 CFR 825.300(b)(1) and (d)(1): the FMLA eligibility notice and the designation notice are due within five business days, absent extenuating circumstances (Electronic Code of Federal Regulations (eCFR))
Federal Rules of Civil Procedure, Rule 12(a)(1)(A)(i): a defendant must serve an answer within 21 days after being served with the summons and complaint (U.S. Government Publishing Office (govinfo))
Federal Rules of Civil Procedure, Rule 6(a)(1): exclude the trigger day, count every day, include the last day unless it is a Saturday, Sunday or legal holiday, then run to the next day that is not; (a)(6): legal holidays are the listed federal holidays, days declared by the President or Congress and, for periods measured after an event, state holidays; (d): 3 days added after service by mail (U.S. Government Publishing Office (govinfo))
45 CFR 164.404(b): breach notification without unreasonable delay and in no case later than 60 calendar days after discovery of a breach (Electronic Code of Federal Regulations (eCFR))
Federal Rules of Civil Procedure, Rule 5(b)(2)(C) and (E): service by mail is complete upon mailing; electronic service is complete upon filing or sending (U.S. Government Publishing Office (govinfo))
Regulation (EU) 2016/679 (GDPR), Article 12(3): action on a request within one month of receipt, a period that may be extended by two further months where necessary (legislation.gov.uk (The National Archives))
California Consumer Privacy Act (CCPA): a business must respond within 45 calendar days and can extend that by another 45 days (90 days total) if it notifies the consumer (State of California, Department of Justice, Office of the Attorney General)

Checked October 9, 2026. All sources

For informational purposes only

Frequently Asked Questions

When is my response due?

Enter the trigger date (when you received the notice or when the event occurred), pick the response window, and the calculator shows the deadline. With "count from day after" checked, the trigger date is day 0 and the next day is day 1; uncheck it when the rule or contract counts the trigger date itself as day 1.

How many calendar days do I have to file an EEOC charge?

According to the EEOC, a charge generally has to be filed within 180 calendar days from the day the discrimination took place. The limit is extended to 300 calendar days if a state or local agency enforces a law that prohibits employment discrimination on the same basis; for age discrimination it is extended only where a state law prohibits it and a state agency enforces that law. Weekends and holidays count, and a deadline that falls on a weekend or holiday moves to the next business day. Pick the 180-day or 300-day option in the Employment Law group.

Do legal deadlines count business days or calendar days?

It depends on the rule, statute or contract. The EEOC charge limit and periods counted under FRCP Rule 6(a)(1) are calendar days, weekends included. The FMLA eligibility and designation notices under 29 CFR 825.300 are due within five business days. A contract or HR policy means whatever its wording says, so check the text.

What is the "count from day after" option?

When checked (the default), the trigger date is day 0 and counting starts the next day, which is how FRCP Rule 6(a)(1)(A) counts: a 30-day period triggered on January 1 ends on January 31. Unchecked, the trigger date is day 1 and the same period ends on January 30. In business-day mode an unchecked box counts the trigger date only if it is a business day.

What happens if my deadline falls on a weekend or holiday?

In business-day mode the count skips weekends and the selected country's public holidays, so the deadline always lands on a working day. In calendar-day mode the calculator shows day N and, if that day is a weekend or public holiday, flags it and shows the next business day. FRCP Rule 6(a)(1)(C) and the EEOC both move such a deadline to the next business day; a contract may not, which is why both dates are shown.

Can I use this for GDPR or CCPA data subject request deadlines?

For the CCPA, yes. The California Attorney General says a business must respond within 45 calendar days and can extend that by another 45 days (90 days total) if it notifies you; choose Custom with 45 calendar days. For the GDPR, no: Article 12(3) gives the controller one month from receipt of the request, extendable by two further months where necessary. A month is not a fixed number of days and this calculator counts days, so it cannot compute that period.