37 CFR § 11.4 - Computing time.

---
identifier: "/us/cfr/t37/s11.4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "37 CFR § 11.4 - Computing time."
title_number: 37
title_name: "Patents, Trademarks, and Copyrights"
section_number: "11.4"
section_name: "Computing time."
chapter_name: "UNITED STATES PATENT AND TRADEMARK OFFICE, DEPARTMENT OF COMMERCE"
subchapter_number: "A"
subchapter_name: "GENERAL"
part_number: "11"
part_name: "REPRESENTATION OF OTHERS BEFORE THE UNITED STATES PATENT AND TRADEMARK OFFICE"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "5 U.S.C. 500; 15 U.S.C. 1123; 35 U.S.C. 2(b)(2), 32, 41; Sec. 1, Pub. L. 113-227, 128 Stat. 2114."
regulatory_source: "69 FR 35452, June 24, 2004, unless otherwise noted."
cfr_part: "11"
---


# 11.4 Computing time.

*Computing time.* The following rules apply in computing any time period specified in this part where the period is stated in days or a longer unit of time:

(a) Exclude the day of the event that triggers the period;

(b) Count every day, including intermediate Saturdays, Sundays, and legal holidays; and

(c) Include the last day of the period, but if the last day is a Saturday, Sunday, or legal holiday, the period continues to run until the end of the next day that is not a Saturday, Sunday, or legal holiday.

[86 FR 28452, May 26, 2021]