To calculate a deadline under the California Code of Civil Procedure, work through four steps in order: skip the day the triggering event happened and start counting the next day, count the correct type of day (calendar or court) as the statute directs, add any extension for the method of service, and then check whether the final date falls on a weekend or holiday and roll it forward if it does. Each step is governed by a specific CCP section, and skipping any of them shifts every date that follows.
Start With Day Zero
CCP Section 12 sets the universal starting rule: exclude the day the triggering event happens, and begin counting on the day after.1California Legislative Information. California Code CCP – Preliminary Provisions Section 12 If you are served on a Wednesday, Wednesday is Day Zero and Thursday is Day 1. Section 12 also tells you to include the last day of the period unless it is a holiday, in which case the deadline moves to the next non-holiday day.
This exclusion rule applies whether you are counting forward from the date of service or backward from a hearing date. Miscounting Day Zero shifts every downstream date by one, which is enough on its own to miss a filing window.
Calendar Days or Court Days?
Unless a specific statute says otherwise, “days” in the CCP means calendar days. You count every day on the calendar, including weekends and holidays. Most discovery deadlines, statutes of limitations, and general response windows use calendar days.
A court day is any day the courthouse is open for business, which excludes weekends and judicial holidays. When a statute or rule specifies court days, you skip every Saturday, Sunday, and recognized holiday in your count. A 16-court-day deadline usually spans about three calendar weeks, not two.
If you’re unsure which applies, read the CCP section governing your particular deadline. It will either say “court days” or it won’t. If it doesn’t, you count calendar days.
Noticed Motions Under CCP 1005
CCP 1005(b) is the workhorse rule for most noticed motions. Moving papers must be served and filed at least 16 court days before the hearing.2California Legislative Information. California Code of Civil Procedure Section 1005 Opposition is due at least nine court days before the hearing. Any reply is due at least five court days before.
Those baseline periods assume personal service. Mail service within California adds five calendar days to the 16-court-day notice period; mail outside California but within the United States adds ten.2California Legislative Information. California Code of Civil Procedure Section 1005 The mail days stack on top of the court-day count. Mixing two kinds of days in one deadline is where the calculation trips people up, so tracking the count on a calendar is essential.
Summary Judgment Under CCP 437c
Summary judgment is the biggest outlier because you count backward using calendar days, not court days. As of January 1, 2025, CCP 437c requires the notice of motion and all supporting papers to be filed at least 81 calendar days before the hearing. Opposition is due 20 calendar days before the hearing, and the reply is due 11 calendar days before.
Service-method extensions under CCP 1013 still apply on top of the 81-day base. If you serve the motion by mail within California, the effective deadline becomes 86 calendar days before the hearing. Older practice guides may still show 75, 14, and 5; those numbers are out of date and will cost you the motion if you rely on them.
Add the Service Extension
After you finish the base count, add extra days based on how the documents were delivered. CCP 1013 sets the extensions for mail service:3California Legislative Information. California Code of Civil Procedure Section 1013
- Mail within California: add 5 calendar days.
- Mail outside California but within the U.S.: add 10 calendar days.
- Mail to an address in the Secretary of State’s Safe at Home program: add 12 calendar days.
- Mail outside the United States: add 20 calendar days.
Service is complete when the envelope is deposited in the mail, but the responding party gets the extra days to account for transit. Those are calendar days, so weekends and holidays inside the extension period still count.
Electronic and Overnight Service
Electronic service and overnight delivery each add two court days to the response period under CCP 1010.6 and CCP 1013(c). Because these are court days rather than calendar days, a two-court-day extension that bridges a weekend actually adds four calendar days. Add a three-day holiday weekend and the extension stretches further. A document electronically served on a Thursday afternoon might look like it pushes the deadline to Monday, but if Monday is a judicial holiday, those two court days do not finish running until Wednesday.
How Extensions Stack
Always complete the base count first, then layer the service extension on top. If a statute gives you a 30-calendar-day response period and the document was mailed within California, your adjusted deadline is Day 35. If the document was served electronically, your adjusted deadline is 30 calendar days plus 2 court days.
Check the Final Date Against the Calendar
The last adjustment happens after everything else. CCP 12a says that if the last day of any deadline falls on a holiday, the deadline extends to the next day that is not a holiday.4California Legislative Information. California Code CCP – Preliminary Provisions Section 12a For this purpose, “holiday” includes every Saturday, every Sunday, and every judicial holiday listed in CCP Section 135.
CCP 12b adds another layer. If any government office is closed for the entire day, that day counts as a holiday for deadline purposes.5California Legislative Information. California Code CCP – Preliminary Provisions Section 12b This matters during unexpected courthouse closures caused by natural disasters or public emergencies. If your local courthouse shuts down on what would have been your filing deadline, you get the next open business day.
CCP 13 covers a related situation: when a legal act is required on a specific calendar date rather than at the end of a counted period. If that specific date falls on a holiday, you can perform the act the next business day with the same legal effect.6California Legislative Information. California Code of Civil Procedure Section 13
One quirk to watch: when a judicial holiday falls on a Sunday, the following Monday is observed as the holiday.7Justia. California Code 6700-6724 – Government Code – Chapter 7 Holidays That combination can push a Friday deadline all the way to Tuesday.
A Worked Example
Suppose you are served by mail within California with a motion set for hearing on a Wednesday, and CCP 1005 governs. The calculation runs backward from the hearing:
- Step 1. The Wednesday hearing is your anchor.
- Step 2. Count backward 16 court days, starting the day before the hearing. Skip Saturdays, Sundays, and judicial holidays. Sixteen court days typically lands about three and a half calendar weeks before the hearing.
- Step 3. Because service was by mail within California, move that date another 5 calendar days earlier. The moving papers had to be served by that earlier date.
- Step 4. If the resulting service date falls on a weekend or holiday, move it to the preceding business day. The serving party needed the papers out before the deadline, not after.
The same hearing gives the responding party a separate calculation. Opposition is due 9 court days before the hearing; reply is due 5 court days before. Those deadlines run independently from the moving party’s service deadline, and any service extensions for opposition and reply papers stack on the same way.
If You Miss a Deadline
A missed deadline is not always the end. CCP 473(b) gives courts two paths to grant relief. The discretionary path applies when a deadline was missed through honest mistake, inadvertence, surprise, or excusable neglect; the motion for relief must be filed within six months of the order you are asking the court to undo. The mandatory path applies when an attorney submits a sworn affidavit taking personal responsibility for the miss, in which case the court must vacate the resulting default, default judgment, or dismissal, though it may order the attorney to pay the opposing party’s reasonable costs.
Neither path saves every deadline. Jurisdictional time limits, including the deadline to appeal, cannot be extended under 473(b). The six-month window is a hard outer limit. Delay is the factor that most consistently sinks relief motions, so if you spot a missed deadline, act immediately.