Preliminary opposition to writ petition: 10 days after petition filed

10 days after filing date of the writ petition, under Cal. Rules of Court, rule 8.487(a)(1).

Rule text

(1) Within 10 days after the petition is filed, the respondent or any real party in interest, separately or jointly, may serve and file a preliminary opposition.

Cal. Rules of Court, rule 8.487(a)(1), official source

Calculate this deadline

Deadline
Monday, November 16, 2026
  1. Trigger (Filing date of the writ petition): Friday, November 6, 2026.
  2. Exclude the trigger day and count 10 calendar days: Monday, November 16, 2026.
Rules applied
Cal. Rules of Court, rule 8.487(a)(1)
(1) Within 10 days after the petition is filed, the respondent or any real party in interest, separately or jointly, may serve and file a preliminary opposition.
Official source
Cal. Rules of Court, rules 1.10, 8.60(a); Cal. Code Civ. Proc. 12, 12a, 12b
CRC 1.10(a): "The time in which any act provided by these rules is to be performed is computed by excluding the first day and including the last, unless the last day is a Saturday, Sunday, or other legal holiday, and then it is also excluded." CRC 1.10(b): "Unless otherwise provided by law, if the last day for the performance of any act that is required by these rules to be performed within a specific period of time falls on a Saturday, Sunday, or other legal holiday, the period is extended to and includes the next day that is not a holiday." CRC 8.60(a): "The Code of Civil Procedure governs computing and extending the time to do any act required or permitted under these rules." CCP 12: "The time in which any act provided by law is to be done is computed by excluding the first day, and including the last, unless the last day is a holiday, and then it is also excluded." CCP 12a(a): "If the last day for the performance of any act provided or required by law to be performed within a specified period of time is a holiday, then that period is hereby extended to and including the next day that is not a holiday. For purposes of this section, “holiday” means all day on Saturdays, all holidays specified in Section 135 and, to the extent provided in Section 12b, all days that by terms of Section 12b are required to be considered as holidays." CCP 12b: "If any city, county, state, or public office, other than a branch office, is closed for the whole of any day, insofar as the business of that office is concerned, that day shall be considered as a holiday for the purposes of computing time under Sections 12 and 12a."
Official source
  • Optional. Court may act without waiting (8.487(a)(4)). Runs from filing; no service extension. Mailbox rule of 8.25(b)(3) does NOT apply to original proceedings (8.25(b)(4)).
  • If the clerk's office is closed or inaccessible on the last day (weather, emergency or local closure orders), the deadline may be extended. Check local orders.

This calculator applies the cited rules to the dates you enter. It is not legal advice. Court orders, local rules, and case-specific facts can change a deadline; verify before relying on it. Rule set pending attorney review.

Worked example

Filing date of the writ petition on Monday, March 15, 2027, personal service: due Thursday, March 25, 2027.

  1. Trigger (Filing date of the writ petition): Monday, March 15, 2027.
  2. Exclude the trigger day and count 10 calendar days: Thursday, March 25, 2027.

Notes

Optional. Court may act without waiting (8.487(a)(4)). Runs from filing; no service extension. Mailbox rule of 8.25(b)(3) does NOT apply to original proceedings (8.25(b)(4)).

Related deadlines

All California appeals and writs deadlines

Rules current as of 2026-10-23. Confirm against the official source and any local rule or court order before relying on a date. Rules changelog.