See it run - a worked example, 100% in this browser tab
What it is
Single-jurisdiction court filing deadline calculator. Applies the federal counting rule (exclude the trigger day, count calendar days, add mail days, roll a weekend or holiday end to the next court day) over the selected jurisdiction court-holiday calendar. Federal periods are cited to the rule; state periods and local-rule timings are flagged so you enter the controlling number. Exact date arithmetic, in-browser, no data leaves the page. Research aid, not legal advice.
Honest scope
Deterministic and citation-backed: every figure is exact arithmetic or a cited rule. Any year- or jurisdiction-indexed value is a confirmable input, never an eternal hardcode. This is a computation tool, not professional (legal, tax, medical, or financial) advice - confirm against the controlling authority for your context.
Authorities cited
Fed. R. Civ. P. 6 (computing and extending time; 3 added days after service by mail). https://www.law.cornell.edu/rules/frcp/rule_6
Fed. R. Civ. P. 12, 15, 26, 33, 34, 36, 59 (response and disclosure periods).
Fed. R. App. P. 4 (time to file a notice of appeal).
5 U.S.C. 6103 (federal legal public holidays; weekend-observation rule).
Run it on your own data
Open it inside GDBS to save runs to Sandbox, attach results to a Worklog case, or share through a Gate client portal - all in the browser, nothing uploaded to anyone’s cloud.