When must Chancery testifying expert reports and demonstratives be filed?

Conclusion of the trial or hearing where the expert testifies or the report is used

Do not substitute initial expert disclosure, report drafting or the first day of a continuing trial. Preserve the completed proceeding event.

Responsible actor. The party presenting the testifying expert reports or demonstrative exhibits. Use the conclusion of the trial or hearing where the expert testified or the report was used. No different filing order applies.

1. Use the conclusion of the trial or hearing where the expert testified or the report was used. No different filing order applies.
2. Exclude the trigger day and count 10 days that are not Saturdays, Sundays or legal holidays under Rule 6(a)(1). These are short-period eligible days, not consecutive calendar days.
3. Check the actual holidays, additional closures and applicable electronic or paper boundary.
4. File the required testifying expert reports and demonstratives, respecting confidentiality and the actual electronic filing boundary.

Rule 6(a)(1) excludes the event day. Periods below eleven days exclude intermediate Saturdays, Sundays and legal holidays; eleven days or more include them. A final weekend or legal holiday moves forward for an after-event period and backward for a before-event period. Rule 6(a)(3) separately addresses actual Register inaccessibility for filings. Rule 6(a)(5) includes section 501 holidays and days declared by the Governor. Good Friday and Thanksgiving Friday are Delaware holidays. Sunday July 4, 2027 is observed Monday July 5. Check county-specific Sussex Return Day and additional actual closures separately; the bundled calendar does not determine those filing conditions.

Rule 6(c) adds three calendar days after the ordinary Rule 6(a) period only for an act measured after service made exclusively by mail. It applies to party acts, not Court acts. Electronic service, an entry-based clock and a filing-based clock do not acquire that addition merely because a paper copy is mailed. These calculations show the disclosed nonexclusive-mail base component; they do not implement the mail-only addition or infer service effectiveness.

These reviewed calculators use the official edition current as of June 1, 2026. Events before that date and backward periods crossing before that date receive no computed or paid date. This is publication coverage, not a finding that an actual procedural act is late. Historical editions, emergency measures, court-modified dates and actual additional closures require separate review.

Fictitious example

Use the conclusion of the trial or hearing where the expert testified or the report was used. No different filing order applies. Ordinary current-edition facts, no changed order and no exclusively mailed incoming service.

Fictitious current-edition facts. This is the disclosed component with no altered order or additional actual closure. It does not establish effective service, completed filing, judicial action or procedural entitlement. Exclusively mailed incoming-service additions require separate review.

Earlier discovery obligations

Expert disclosure and discovery-service obligations are separate from this post-proceeding filing requirement.

Altered filing order

The Court may direct a different filing arrangement or time.

Mail-only service and actual court schedule

Rule 6(c) adds three calendar days after the ordinary Rule 6(a) period only for an act measured after service made exclusively by mail. It applies to party acts, not Court acts. Electronic service, an entry-based clock and a filing-based clock do not acquire that addition merely because a paper copy is mailed. These calculations show the disclosed nonexclusive-mail base component; they do not implement the mail-only addition or infer service effectiveness.

Current edition and historical scope

These reviewed calculators use the official edition current as of June 1, 2026. Events before that date and backward periods crossing before that date receive no computed or paid date. This is publication coverage, not a finding that an actual procedural act is late. Historical editions, emergency measures, court-modified dates and actual additional closures require separate review.

• Use the conclusion of the trial or hearing where the expert testified or the report was used. No different filing order applies.
• The base calculation does not obtain an extension, resolve a different branch or establish that the responsible actor completed the required act.

• Conclusion of the trial or hearing where the expert testifies or the report is used
• Do not substitute initial expert disclosure, report drafting or the first day of a continuing trial. Preserve the completed proceeding event.
• Expert disclosure and discovery-service obligations are separate from this post-proceeding filing requirement.
• The Court may direct a different filing arrangement or time.
• File the required testifying expert reports and demonstratives, respecting confidentiality and the actual electronic filing boundary.
• For electronic service and filing, Rule 5(d) uses midnight for an original complaint, notice of appeal, or paper in a summary proceeding or an action ordered expedited. Other papers in other actions must be served or filed by 5:00 p.m. Use Delaware local court time and preserve actual completed transmission and docket treatment. Do not replace the ordinary boundary with a federal midnight rule. Rule 5(c)(2)(B) permits self-represented delivery to the Register with the required fee, deemed filed when delivered. Check actual office availability. Rule 5(e) permits the Court, on satisfactory proof, to deem an unsuccessful electronic attempt timely; relief is not automatic.