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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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57 sections with “calendar days”: the first 40

  • FAR 52.209-9 Updates of Publicly Available Information Regarding Responsibility Matters.
    …he non-public segment of FAPIIS is automatically transferred after a waiting period of 14 calendar days, except for— (i) Past performance reviews required by subpart 42.15; (ii) Information that was entered prior to April 15, 2011; or (i…
  • FAR 52.211-8 Time of Delivery.
    …on the Contractor's date of receipt of the contract or notice of award by adding (1) five calendar days for delivery of the award through the ordinary mails, or (2) one working day if the solicitation states that the contract or notice of a…
  • FAR 52.211-9 Desired and Required Time of Delivery.
    …on the Contractor's date of receipt of the contract or notice of award by adding (1) five calendar days for delivery of the award through the ordinary mails, or (2) one working day if the solicitation states that the contract or notice of a…
  • FAR 52.222-54 Employment Eligibility Verification.
    …ctor shall— (i) Enroll. Enroll as a Federal Contractor in the E-Verify program within 30 calendar days of contract award; (ii) Verify all new employees. Within 90 calendar days of enrollment in the E-Verify program, begin to use E-Verify …
  • FAR 9.105-2 Determinations and documentation.
    …he non-public segment of FAPIIS is automatically transferred after a waiting period of 14 calendar days, except for— (1) Past performance reviews required by subpart 42.15; (2) Information that was entered prior to April 15, 2011; or (3)…
  • 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 …
  • DFARS 252.234-7002 Earned Value Management System.
    …ntractor of the acceptability of such changes as soon as practicable (generally within 30 calendar days) after receipt of the Contractor's notice of proposed changes. If the CFA waives the advance approval requirements, the Contractor shall…
  • 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 52.214-16 Minimum Bid Acceptance Period.
    … Period (APR 1984) (a) Acceptance period, as used in this provision, means the number of calendar days available to the Government for awarding a contract from the date specified in this solicitation for receipt of bids. (b) This provisio…
  • DFARS 252.247-7026 Evaluation Preference for Use of Domestic Shipyards—Applicable to Acquisition of Carriage by Vessel for DoD Cargo in the Coastwise or Noncontiguous Trade.
    …r, and maintenance work means work requiring a shipyard period greater than or equal to 5 calendar days. U.S. shipyard means a shipyard that is located in any State of the United States or in Guam. (b) This solicitation includes an evalua…
  • FAR 3.705 Procedures.
    …ll be made in writing and sent by certified mail, return receipt requested. (2) A thirty calendar day period after receipt of the notice, for the contractor to submit pertinent information before any final decision is made. (3) Upon reque…
  • FAR 19.103 Appealing the contracting officer's North American Industry Classification System code and size standard determination.
    …ICS code designation and the applicable size standard shall be served and filed within 10 calendar days after the issuance of the initial solicitation or any amendment affecting the NAICS code or size standard. However, SBA may file a NAICS…
  • FAR 19.1505 Set-aside procedures.
    …entity identifier, type of set-aside, NAICS code, and solicitation number. (1) Within 15 calendar days from the date of the contracting officer's notification, SBA will make a determination regarding the offeror's status as an EDWOSB or WO…
  • FAR 22.404-6 Modifications of wage determinations.
    …the contracting agency, or is published on the Wage Determinations at SAM.gov, 10 or more calendar days before the date of bid opening; or (ii) It is received by the contracting agency, or is published on the Wage Determinations at SAM.gov…
  • FAR 42.1503 Procedures.
    …ification when an evaluation is ready for comment. Contractors shall be afforded up to 14 calendar days from the date of notification of availability of the past performance evaluation to submit comments, rebutting statements, or additional…
  • 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 52.214-15 Period for Acceptance of Bids.
    …In compliance with the solicitation, the bidder agrees, if this bid is accepted within __ calendar days (60 calendar days unless a different period is inserted by the bidder) from the date specified in the solicitation for receipt of bids, …
  • FAR 52.225-8 Duty-Free Entry.
    … products. The Contractor shall furnish the notice to the Contracting Officer at least 20 calendar days before the importation. The notice shall identify the— (i) Foreign supplies; (ii) Estimated amount of duty; and (iii) Country of orig…
  • FAR 52.234-4 Earned Value Management System.
    …tation. The CFA will advise the Contractor of the acceptability of such changes within 30 calendar days after receipt of the notice of proposed changes from the Contractor. If the advance approval requirements are waived by the CFA, the Con…
  • 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 52.248-1 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…
  • DFARS 217.7005 Solicitation provision.
    …r Exchange, when offering nonexcess personal property for exchange. Allow a minimum of 14 calendar days for the inspection period in paragraph (b) of the clause if the exchange property is in the contiguous United States. Allow at least 21 …
  • FAR 14.202-1 Bidding time.
    … (i.e., the time between issuance of the solicitation and opening of bids) of at least 30 calendar days shall be provided when synopsis is required by subpart 5.2. (b) Factors to be considered. Because of unduly limited bidding time, some …
  • FAR 19.306 Protesting a firm's status as a HUBZone small business concern.
    …ring a HUBZone status protest is precluded from applying for HUBZone certification for 90 calendar days from the date of the SBA final decision. (j) Appeals of HUBZone status determinations. The protested HUBZone small business concern, th…
  • FAR 19.804-3 SBA acceptance.
    …not receive a reply from the Associate Administrator for Business Development within five calendar days of receipt of the contracting office's request. (2) For acquisitions not exceeding the simplified acquisition threshold, when the contr…
  • FAR 19.812 Contract administration.
    …l, except in the case of death or incapacity where the waiver must be submitted within 60 calendar days after such an occurrence. The clauses in the contract entitled “Special 8(a) Contract Conditions” and “Special 8(a) Subcontract Conditio…
  • FAR 22.404-1 Types of wage determinations.
    …ncy. It is used only when no general wage determination applies, and is effective for 180 calendar days from the date of the determination. However, if a determination expires before contract award, it may be possible to obtain an extension…
  • FAR 22.406-6 Payrolls and statements.
    …Payrolls and Basic Records, the contractor must submit or cause to be submitted, within 7 calendar days after the regular payment date of the payroll week covered, for the contractor and each subcontractor, (1) copies of weekly payrolls app…
  • FAR 22.1305 Waivers.
    …sealed bidding, such withdrawal does not apply unless the withdrawal is made more than 10 calendar days before the date set for the opening of bids.
  • FAR 22.1905 Enforcement of Executive Order Minimum Wage Requirements.
    …t to which E.O. 14026 applies, the contracting agency, on its own initiative or within 15 calendar days of notification by an authorized representative of the Department of Labor, shall incorporate the contract clause in the contract retroa…
  • FAR 28.202 Acceptability of corporate sureties.
    …he contracting officer within the time specified on the bid form, which may not exceed 45 calendar days after the execution of the bond. The contractor shall use Standard Form (SF) 273, Reinsurance Agreement for a Bonds Statute Performance …
  • FAR 32.006-4 Procedures.
    …tion received by an agency head in connection with such decision. (h) Not later than 180 calendar days after the date of the reduction or suspension action, the remedy coordination official shall— (1) Review the agency head's determinatio…
  • FAR 36.701 Standard and optional forms for use in contracting for construction or dismantling, demolition, or removal of improvements.
    …od, the contracting officer shall insert in the blank provided in Block 13D the number of calendar days that the offer must be available for acceptance after the date offers are due. (b) Optional Form 347, Order for Supplies or Services, m…
  • 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 52.232-12 Advance Payments.
    …ate specified in subparagraph (f)(3) below. Interest shall be computed at the end of each calendar month for the actual number of days involved. For the purpose of computing the interest charge— (i) Advance payments shall be considered as …
  • FAR 52.232-17 Interest.
    … default termination. (f) The interest charge shall be computed for the actual number of calendar days involved beginning on the due date and ending on— (1) The date on which the designated office receives payment from the Contractor; (2…
  • 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 (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.