Military designation of days and hours
NATO STANAG military term
NATO designations are specified in Allied Administrative Publication AAP-6 (STANAG 3680) NATO Glossary of Terms and Definitions, and marked (NATO) in this list. Entries specific to the U.S. and defined only in Joint Publication JP 1-02 are marked (US).
Times relative to the designation are indicated with +/−[Arabic numeral] after the letter, replacing -day or -hour with a count of the same unit: "D−1" (the day before D-Day), "L+9" (9 hours after L-Hour) etc. In less formal contexts, the symbol or numeral may be spelled out: "D minus 1" or "L plus nine."
A-Day
20 October 1944, the day the Leyte Island Operation began.
C-Day
Short for "Commencement Day" which usually means when deployment for an operation commences. It is called "Candy Day" because before deployment candy is usually passed out to G.I.s from charitable organizations. (US)
D-Day
The unnamed day on which an operation commences or is due to commence. The most famous D-Day was June 6, 1944, when "Operation Overlord" began. (NATO). The "D" may stand for "Day".
Begin with the source’s own compact description: “Military designation of days and hours” is nATO STANAG military term. The dossier treats that line as a proposition to test through Military, designation and days, not as a finished interpretation.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Apr 17, 2025. The linked authority identifier is Q1986022. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1944.
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