39 CFR § 964.12 - Computation of time.

---
identifier: "/us/cfr/t39/s964.12"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "39 CFR § 964.12 - Computation of time."
title_number: 39
title_name: "Postal Service"
section_number: "964.12"
section_name: "Computation of time."
chapter_name: "UNITED STATES POSTAL SERVICE"
subchapter_number: "N"
subchapter_name: "PROCEDURES"
part_number: "964"
part_name: "WITHHELD MAIL"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "39 U.S.C. 204, 401, 3003, 3004; 5 U.S.C. 554."
regulatory_source: "52 FR 36763, Oct. 1, 1987, unless otherwise noted."
cfr_part: "964"
---


# 964.12 Computation of time.

A designated period of time under these rules means calendar days, excludes the day the period begins, and includes the last day of the period unless the last day is a Saturday, Sunday, or legal holiday, in which case the period runs until the close of business on the next business day.