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Date Add / Subtract Calculator

When a filing window is measured in days and a missed date can sink a motion, eyeballing the calendar isn't good enough. Our Date Add / Subtract tool gives you a clean, no-nonsense way to count forward or backward from any starting date — perfect for service-of-process windows, response deadlines, statute-of-limitations math, discovery cutoffs, and notice periods. Drop in your base date, choose days, months, or years, and get the resulting date in one click. The Date Add / Subtract calculator handles month-end rollovers and leap years correctly, so February 29 plus one year doesn't quietly become an invalid date in your calendar entry. Whether you're calendaring a 30-day answer

Come usare Date Add / Subtract Calculator

  1. Enter your starting date. Pick the trigger date — service date, filing date, contract execution date, or whatever event starts the clock.
  2. Choose add or subtract. Add to count forward to a deadline. Subtract to work backward from a hearing or known due date.
  3. Set the interval. Type the number of days, months, or years. Use days for most procedural deadlines; months or years for statutes and notice periods.
  4. Run the calculation. The resulting date appears instantly, with month-end and leap-year edge cases handled automatically.
  5. Verify against the rules. Cross-check the result against the applicable rule (e.g., FRCP 6, local court rules) for weekend or holiday rollovers.
  6. Calendar the date. Copy the output into your docket, matter file, or calendar reminder so the deadline doesn't slip.

Domande frequenti

Does this tool account for weekends and court holidays? No. It returns the raw calendar date. Most procedural rules require you to roll forward to the next business day if the date lands on a weekend or holiday — apply that rule yourself based on your jurisdiction.
How does it handle month-end dates like January 31 plus one month? When the target month has fewer days, the result lands on the last valid day of that month. So January 31 plus one month returns February 28 (or 29 in a leap year).
Can I use it for statute-of-limitations calculations? Yes. Enter the accrual date, add the limitations period in years, and you get the outside date. Always confirm against tolling provisions and the controlling statute.
Does it work for counting backward from a deadline? Yes. Select subtract to count back from a hearing, trial date, or fixed deadline to figure out when prep work, disclosures, or notices are due.
Is anything I enter saved or sent anywhere? No. Calculations run locally in your browser. Nothing about your matter, dates, or inputs leaves the page.
Can I add years and months in the same calculation? Run them sequentially — add the years first, then add the months to that result. This avoids ambiguity in how mixed intervals roll over.
What date format does it accept? Standard date input — pick from the calendar widget or type in your local format. The output is shown in a clear, unambiguous format you can copy into a docket entry.

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