What CCP § 1005 requires

California Code of Civil Procedure § 1005(b) sets the notice requirements for motions in civil proceedings, including family law. If you’re filing a motion to be heard in a California Superior Court, these are the rules you need to follow.

The core requirement: written notice of a motion must be served and filed a minimum number of days before the hearing date. Those days are measured in court days - not calendar days.

The 16-9-5 rule

For most noticed motions:

16 court days before the hearing: the motion and all supporting papers must be filed and served
9 court days before the hearing: opposition papers must be filed and served
5 court days before the hearing: reply papers must be filed and served

What is a court day?

A court day is any day the court is open for business. This excludes:

Saturdays
Sundays
Court holidays (which vary by county)

This distinction matters more than it sounds. A deadline that falls on a court holiday gets pushed to the next court day - and if you’re counting backward from the hearing date, that means your deadline is earlier than you might expect.

Step-by-step calculation

Step 1: Start with the hearing date

Count backward from the hearing date, not forward from today. The hearing date itself is not counted.

Step 2: Count court days backward

For the motion filing deadline, count 16 court days backward from the hearing. Skip weekends and court holidays for the specific county where the hearing will take place.

Example: If the hearing is on a Monday, and you’re counting backward 16 court days, you’ll pass through roughly 3 calendar weeks - more if there are court holidays in the window.

Step 3: Adjust for service method

After calculating the base deadline, add additional time based on how you’re serving the papers:

Personal service: No additional days
Mail within California: Add 5 calendar days (not court days)
Mail outside California, within U.S.: Add 10 calendar days
Electronic service (by consent): Add 2 court days

Important: the service extension uses calendar days for mail and court days for electronic service. This is one of the most common sources of calculation errors.

Step 4: Check the result

If your calculated deadline falls on a weekend or court holiday, the deadline moves to the next court day - which means earlier, since you’re counting backward.

Example calculation

Hearing date: Monday, July 20, 2026 County: Santa Clara Service method: Electronic service (by consent)

Motion filing deadline: Starting from July 20, count backward 16 court days (skipping weekends and Santa Clara court holidays):

The 16th court day back lands on approximately June 25, 2026

With electronic service adjustment: Add 2 court days to the notice period, which means the motion must be served 18 court days before the hearing - approximately June 23, 2026.

Opposition deadline: 9 court days before July 20 = approximately July 7, 2026 (+ 2 court days for electronic service = July 2, 2026)

Reply deadline: 5 court days before July 20 = approximately July 13, 2026 (+ 2 court days for electronic service = July 9, 2026)

Note: These dates are approximate. Exact dates depend on the specific court holiday calendar for the year.

Common errors

Error 1: Using calendar days instead of court days

The 16-9-5 deadlines are in court days. If you count calendar days, you’ll get different - and incorrect - results.

Error 2: Wrong county holiday calendar

Santa Clara County may have different court holidays than San Francisco or Alameda. Always use the holiday calendar for the county where the motion will be heard.

Error 3: Mixing up service day types

Mail service adds calendar days. Electronic service adds court days. Using the wrong type changes the deadline.

Error 4: Forgetting that “backward” means earlier

When counting backward from the hearing, a court holiday doesn’t give you more time - it makes your deadline fall earlier. The hearing date is fixed; you need more lead time when holidays are in the window.

Why automation matters

For solo attorneys managing 15-30 matters across multiple Bay Area counties, manually calculating CCP § 1005 deadlines for every motion is tedious and error-prone. The county-specific court holiday calendars change yearly, and a miscalculation can mean a missed deadline - which is one of the most common grounds for malpractice claims.

Automated deadline calculation tools that know your county’s specific calendar, understand the court day vs. calendar day distinction, and account for service method adjustments remove the manual counting entirely. You provide the hearing date and county; the tool provides the filing, service, opposition, and reply dates.

The result: less time counting days on a calendar, more confidence that the dates are right.