California courts
What is the deadline for demand for exchange of expert witness information?
Demand for exchange of expert witness information is governed by Code of Civil Procedure s 2034.220. This page does not calculate a date. TWO-LIMBED PROVISION THAT CANNOT BE REDUCED TO A SINGLE PERIOD. Read the rule text and the noted conditions before relying on any date.
Read why no date is calculated- Period
- 70 calendar days
- Trigger
- The setting of the initial trial date, or the initial trial date itself
- Rule
- Code of Civil Procedure s 2034.220
California rules as encoded, holiday calendar verified
Source guide · No automated date
Why this page does not calculate a date
TWO-LIMBED PROVISION THAT CANNOT BE REDUCED TO A SINGLE PERIOD. The demand deadline is whichever of two competing computations is "closer to the trial date": the 10th day counted FORWARD from the date on which the initial trial date is set, or 70 days counted BACKWARD from that initial trial date. Encoded here on the 70-day backward limb because that is the controlling limb in a case set well in advance, but an engine must compute both candidate dates and take the one nearer to trial. Do not present a single date without running both limbs.
Read California Rules of CourtAny party may make a demand for an exchange of information concerning expert trial witnesses without leave of court. A party shall make this demand no later than the 10th day after the initial trial date has been set, or 70 days before that trial date, whichever is closer to the trial date.
Code of Civil Procedure s 2034.220
Which date starts the 70-day period?
The period runs from the setting of the initial trial date, or the initial trial date itself.
Count backward from the trigger event. Confirm the event on the docket or in the service record before entering a date.
Read California Rules of CourtAny party may make a demand for an exchange of information concerning expert trial witnesses without leave of court. A party shall make this demand no later than the 10th day after the initial trial date has been set, or 70 days before that trial date, whichever is closer to the trial date.
Code of Civil Procedure s 2034.220
This period runs from the specific event in the cited rule. Do not substitute a nearby date such as a hearing, a courtesy copy or the day you first learned of it.
Which date do I enter?How are the 70 calendar days counted?
- Exclude the day of the trigger event.
- Count every following day, including intermediate Saturdays, Sundays and legal holidays.
- If the last day is a Saturday, Sunday or California legal holiday, continue to the next day that is not one of those.
Exclude the trigger day and count calendar days under Code of Civil Procedure ss 12, 12a, 12b, 12c.
If the final day is a Saturday, Sunday or legal holiday in the California calendar, the computation rule carries it to the next open day.
California computes time under Code of Civil Procedure ss 12, 12a, 12b, 12c. The applied calendar bundles the state legal holidays for the covered years; court-specific closures and emergency orders are not bundled.
Read Code of Civil Procedure ss 12, 12a, 12b, 12cThe calculation gives the ordinary national-rule date. Check relevant holidays, the court’s accessibility and its filing cutoff separately.
Review the filing checklistWhy no worked calculation is shown
No date is calculated on this page because the encoded provision could not be reduced to one fixed period. Read the rule text, the starting event and the noted branches, then confirm the period in the current rules before relying on any date.
TWO-LIMBED PROVISION THAT CANNOT BE REDUCED TO A SINGLE PERIOD. The demand deadline is whichever of two competing computations is "closer to the trial date": the 10th day counted FORWARD from the date on which the initial trial date is set, or 70 days counted BACKWARD from that initial trial date. Encoded here on the 70-day backward limb because that is the controlling limb in a case set well in advance, but an engine must compute both candidate dates and take the one nearer to trial. Do not present a single date without running both limbs.
Can an order, motion or extension change the deadline?
- Extensions
- No leave of court is required to make the demand, and the statute provides no extension of the outer date. A party that misses it loses the right to compel an exchange as of right and is left to seek relief on motion, for example under CCP 2034.710 for tardy submission of expert information.
- Orders and local rules
- A scheduling order, stipulation approved by the court, standing order or local rule can set a different period and controls over the national default.
- No leave of court is required to make the demand, and the statute provides no extension of the outer date. A party that misses it loses the right to compel an exchange as of right and is left to seek relief on motion, for example under CCP 2034.710 for tardy submission of expert information.
- A stipulation, scheduling order, standing order or local rule can set a different period and controls over the national default.
- TWO-LIMBED PROVISION THAT CANNOT BE REDUCED TO A SINGLE PERIOD. The demand deadline is whichever of two competing computations is "closer to the trial date": the 10th day counted FORWARD from the date on which the initial trial date is set, or 70 days counted BACKWARD from that initial trial date. Encoded here on the 70-day backward limb because that is the controlling limb in a case set well in advance, but an engine must compute both candidate dates and take the one nearer to trial. Do not present a single date without running both limbs.
What should I check before filing?
These checks help you review the result. They do not activate a calendar date or certify that the deadline applies.
Common questions
Find answers about when this 70-day period starts, how it is counted, what can change it and how to keep your calculation.
Starting the clock
Does the clock start on the setting of the initial trial date, or the initial trial date itself, or when I first learned of it?
The period runs from the setting of the initial trial date, or the initial trial date itself as the rule defines it, not from the day you read about it, received a courtesy copy or attended a hearing. Use the date shown on the docket or in the service record.
Counting days and filing
Is it 70 calendar days or business days?
Calendar days. Count intermediate weekends and holidays. If the final day is a Saturday, Sunday or legal holiday, Code of Civil Procedure ss 12, 12a, 12b, 12c carries it forward to the next day that is not one of those.
Code of Civil Procedure ss 12, 12a, 12b, 12cWhich time zone and filing cutoff apply?
California filing rules and the court’s electronic filing system set the cutoff. This calculator does not verify filing hours or system availability.
Code of Civil Procedure ss 12, 12a, 12b, 12cWhat if the court is inaccessible on the last day?
Code of Civil Procedure ss 12, 12a, 12b, 12c and the court’s administrative orders govern an inaccessible clerk’s office. Check the court’s notices. This calculator does not predict a closure.
Code of Civil Procedure ss 12, 12a, 12b, 12cExtensions and local rules
Can the court extend this deadline?
No leave of court is required to make the demand, and the statute provides no extension of the outer date. A party that misses it loses the right to compel an exchange as of right and is left to seek relief on motion, for example under CCP 2034.710 for tardy submission of expert information. A request does not itself extend the period, and no discretionary extension is calculated here.
Do local rules, standing orders or a scheduling order change the date?
They can. Many courts set their own periods by local rule, standing order or case-specific order, and those control over the national default. This calculator gives the national-rule date only; compare it with any order in the case before relying on it.
Choosing the right calculator
Does this calculator decide whether the rule applies to my case?
No. It calculates a period from the date you provide under the cited rule. It does not decide whether the rule governs your filing, whether an exception applies, or whether the filing has merit. Those questions need separate review.
Can I calculate the deadline without an account?
Yes. Enter the trigger date to see the free national-rule calculation, citation, counting steps and warnings. You can add court context after the result. Missing court review keeps the result provisional.
Results, records and your case
What is included in an Evidence Record?
The retained inputs, result, cited rule, calculation working, warnings and review state. The PDF includes a payload digest and retained-data appendix, and the record can be verified against its fingerprint later. It records the calculation, not a guarantee of legal correctness.
Does saving to a case activate the calendar?
Not automatically. Provisional records remain subject to review. A separately labeled manual date does not alter the original calculation.
Official sources and review
The period and the counting method come from different provisions. The official source is the court’s published rules; the reading links open the rule text at the Legal Information Institute.
| Provision | Purpose |
|---|---|
| Code of Civil Procedure s 2034.220 | Trigger and period |
| Code of Civil Procedure ss 12, 12a, 12b, 12c | Counting, holidays and the last day |
Rule record reviewed . Guide sources checked . Next source check .
Published by Deadline Engine. This tool calculates the ordinary period under the cited rule. It does not decide whether the rule applies, obtain an extension or file anything for you.