21 CFR § 810.3 - Computation of time.

---
identifier: "/us/cfr/t21/s810.3"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "21 CFR § 810.3 - Computation of time."
title_number: 21
title_name: "Food and Drugs"
section_number: "810.3"
section_name: "Computation of time."
chapter_name: "FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES"
subchapter_number: "H"
subchapter_name: "MEDICAL DEVICES"
part_number: "810"
part_name: "MEDICAL DEVICE RECALL AUTHORITY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "21 U.S.C. 321, 331, 332, 333, 334, 351, 352, 355, 360h, 360i, 371, 374, 375."
regulatory_source: "61 FR 59018, Nov. 20, 1996, unless otherwise noted."
cfr_part: "810"
---


# 810.3 Computation of time.

In computing any period of time prescribed or allowed by this part, the day of the act or event from which the designated period of time begins to run shall not be included. The computation of time is based only on working days.