Courtready's Ontario Superior Court Litigation Deadlines Calculator

Last updated: Version 2 - January 20, 2026.

Use this free tool to calculate litigation deadlines under Ontario's Rules of Civil Procedure. This calculator determines the date on which a deadline falls by applying Rule 3.01 (computation of time) and Rule 1.03 (definition of "holiday"), including weekends and Ontario court holidays.

DO NOT USE THIS CALCULATOR FOR SMALL CLAIMS COURT DEADLINES. Use this one instead. This calculator does not account for special holidays proclaimed by the Governor General or Lieutenant Governor under Rule 1.03(1)(m). Always check for any proclaimed holidays that may affect your deadline.

Disclaimer: This tool is provided for reference purposes only. Always verify deadlines against applicable law and seek legal advice when appropriate. For questions or to report an error, please email Tom at [email protected].

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What are you trying to calculate?

A deadline AFTER an event Choose this when a rule gives you X days AFTER an event to do something. For example, "a statement of defence...shall be delivered, (a) within twenty days after service of the statement of claim, where the defendant is served in Ontario" (r. 18.01(a)).

A deadline BEFORE an event Choose this when a rule gives you X days BEFORE an event to do something. For example, "at least seven days before the mediation session, every party shall prepare a statement...and provide a copy to...the mediator" (r. 24.1.10(1)).

Count days BETWEEN two dates Choose this if you want to know how many days are between event A and event B.

The "BETWEEN" option uses the rule 3.01(1)(a) convention: exclude the first date, include the second.

Enter the relevant dates and deadline

Event date (e.g., date of service, issuance, or hearing):

Number of days (i.e., the deadline):

First date (earlier event):

Second date (later event):

OPTIONAL - Service details (see instructions below)

Is the "Event date" from Step 2 the date of SERVICE of a non-originating process? (r. 3.01(1)(d))

An "originating process" is a document that starts a lawsuit. It includes documents like, among others, a statement of claim, notice of action, notice of application, counterclaim against a new party, or a third or subsequent party claim. If the "event date" from step two is the date of service of an originating process, then rule 3.01(1)(d) does not apply, and you should select "No".

No Yes

Document was served after 4:00 PM Document was served on a holiday (if known)

Rule 3.01(1)(d): If checked, service made after 4:00 PM or on a holiday is deemed to have been made on the next day that is not a holiday. Select "No" here UNLESS the "event date" from step two is the date of service of a non-originating process.

Calculate

Result:

Explanation

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