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48 CFR · Federal Acquisition Regulation and Defense supplement

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The codified text (eCFR, as of 2026-10-02). Under the Revolutionary FAR Overhaul ↗, agencies follow class deviations with new text for many parts while the formal rules go through the Federal Register: check the solicitation and your contract's clauses, which rule.

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17 sections with “calendar day of delay”

  • FAR 52.211-10 Commencement, Prosecution, and Completion of Work.
    …ed to (a) commence work under this contract within __ [Contracting Officer insert number] calendar days after the date the Contractor receives the notice to proceed, (b) prosecute the work diligently, and (c) complete the entire work ready …
  • FAR 52.243-7 Notification of Changes.
    …the Administrative Contracting Officer in writing promptly, within ___ (to be negotiated) calendar days from the date that the Contractor identifies any Government conduct (including actions, inactions, and written or oral communications) t…
  • FAR 52.212-1 Instructions to Offerors—Commercial Products and Commercial Services.
    … for acceptance of offers. The offeror agrees to hold the prices in its offer firm for 30 calendar days from the date specified for receipt of offers, unless another time period is specified in an addendum to the solicitation. (d) Product …
  • FAR 52.215-1 Instructions to Offerors—Competitive Acquisition.
    … as the result of negotiations. Time, if stated as a number of days, is calculated using calendar days, unless otherwise specified, and will include Saturdays, Sundays, and legal holidays. However, if the last day falls on a Saturday, Sund…
  • FAR 11.403 Supplies or services.
    …officer may express contract delivery or performance schedules in terms of— (1) Specific calendar dates; (2) Specific periods from the date of the contract; i.e., from the date of award or acceptance by the Government, or from the date sh…
  • FAR 52.209-3 First Article Approval—Contractor Testing.
    …ontractor shall test __ unit(s) of Lot/Item __ as specified in this contract. At least __ calendar days before the beginning of first article tests, the Contractor shall notify the Contracting Officer, in writing, of the time and location o…
  • FAR 52.211-11 Liquidated Damages—Supplies, Services, or Research and Development.
    …or shall, in place of actual damages, pay to the Government liquidated damages of $__ per calendar day of delay [Contracting Officer insert amount]. (b) If the Government terminates this contract in whole or in part under the Default—Fixed…
  • FAR 52.211-12 Liquidated Damages—Construction.
    …amages to the Government in the amount of __ [Contracting Officer insert amount] for each calendar day of delay until the work is completed or accepted. (b) If the Government terminates the Contractor's right to proceed, liquidated damages…
  • DFARS 252.217-7009 Default.
    … Contractor shall pay to the Government as fixed, agreed, and liquidated damages for each calendar day of delay the amount, if any, set forth in the job order (prorated to the nearest hour for fractional days). (2) If the Government termin…
  • FAR 52.209-4 First Article Approval—Government Testing.
    …ll insert details] (a) The Contractor shall deliver __ units(s) of Lot/Item __ within __ calendar days from the date of this contract to the Government at ___ [insert name and address of the testing facility] for first article tests. The s…
  • FAR 52.212-4 Contract Terms and Conditions—Commercial Products and Commercial Services.
    …default termination. (vi) The interest charge shall be computed for the actual number of calendar days involved beginning on the due date and ending on— (A) The date on which the designated office receives payment from the Contractor; (B…
  • FAR 52.248-1 Value Engineering.
    …period beginning with acceptance of the first unit incorporating the VECP and ending at a calendar date or event determined by the contracting officer for each VECP. Unit, as used in this clause, means the item or task to which the Contrac…
  • FAR 52.232-25 Prompt payment.
    …and 32.902 of the Federal Acquisition Regulation. All days referred to in this clause are calendar days, unless otherwise specified. (However, see paragraph (a)(4) of this clause concerning payments due on Saturdays, Sundays, and legal holi…
  • FAR 52.232-26 Prompt Payment for Fixed-Price Architect-Engineer Contracts.
    …and 32.902 of the Federal Acquisition Regulation. All days referred to in this clause are calendar days, unless otherwise specified. (However, see paragraph (a)(3) of this clause concerning payments due on Saturdays, Sundays, and legal holi…
  • FAR 52.232-27 Prompt Payment for Construction Contracts.
    …and 32.902 of the Federal Acquisition Regulation. All days referred to in this clause are calendar days, unless otherwise specified. (However, see paragraph (a)(3) concerning payments due on Saturdays, Sundays, and legal holidays.) (a) Inv…
  • FAR 52.245-1 Government Property.
    … is vested in the Contractor under this paragraph within 10 days following the end of the calendar quarter during which it was received. Vesting title under this paragraph is subject to civil rights legislation, 42 U.S.C. 2000d. Before titl…
  • FAR 52.248-3 Value Engineering—Construction.
    …1) The Contracting Officer will notify the Contractor of the status of the VECP within 45 calendar days after the contracting office receives it. If additional time is required, the Contracting Officer will notify the Contractor within the …

FAR (chapter 1)

DFARS (chapter 2, Defense)

Source: eCFR, 48 CFR chapters 1 and 2 (GPO GovInfo bulk data) ↗. Rule changes in progress: FAR, DFARS. Terms: glossary.