- M day, M Day and M-day redirect here. For the Marvel Universe event, see Decimation (comics)
The military designation of days and hours within the North Atlantic Treaty Organisation (NATO), is specified in AAP-6 (STANAG 3680), NATO Glossary of Terms and Definitions, and marked (NATO) in what follows. The North Atlantic Treaty STANAG is the NATO abbreviation for Standardization Agreement, which set up processes procedures terms and conditions for common Military or technical Those entries marked (US) are specific to the U. S. , and defined only in Joint Publication JP 1-02, Department of Defense Dictionary of Military and Associated Terms.
References to days (or hours) preceding or following a designated day (or hour) use a plus or minus sign and an Arabic numeral following the letter. For example, "D−3" is 3 days prior to D-day, "C+7" is 7 days after C-day, "H−2" is 2 hours before H-hour, and so forth (ref: FM 101-5-1 Operational Terms & Graphics (U.S.)). In less formal contexts, the time is usually spelled out, so that "D−3" becomes "D minus three" or "D minus 3".
- A-Day was 20 October 1944, the day the Leyte Island Operation (the invasion of Leyte) began . The Battle of Leyte in the Pacific campaign of World War II was the invasion and conquest of Leyte in the Philippines by American Events 1740 - Maria Theresa takes the throne of Austria. France, Prussia, Bavaria and Saxony Year 1944 ( MCMXLIV) was a Leap year starting on Saturday (link will display full calendar of the Gregorian calendar. The Battle of Leyte in the Pacific campaign of World War II was the invasion and conquest of Leyte in the Philippines by American
- C-Day is short for "Candy Day" which usually means when deployment for an operation commences. Military deployment is the movement of armed forces and their logistical support infrastructure This article describes three distinct but related terms military operations Operations as military events and operational level of war It is called "Candy Day" because before deployment candy is usually passed out to G. I. s from charitable organizations. (US)
- D-Day is the unnamed day on which an operation commences or is due to commence. This may be the commencement of hostilities or any other operation. The most famous is D-Day, June 6, 1944, when "Operation Overlord" began. D-Day may also refer to Decimal Day in the United Kingdom. D-Day is a term often used in Military parlance to denote Events 1508 - Maximilian I Holy Roman Emperor, is defeated in Friulia by Venetian forces; he is forced to sign a three-year Year 1944 ( MCMXLIV) was a Leap year starting on Saturday (link will display full calendar of the Gregorian calendar. Operation Overlord was the code name for the invasion of northwest Europe during World War II by Allied forces Contrary to popular belief, the "D" does not stand for any specific word - the most popular being disembark. (NATO)
- E-Day is the unnamed day on which a NATO exercise commences. (NATO)
- F-Hour is the effective time of announcement by the U. S. Secretary of Defense to the Military Departments of a decision to mobilize Reserve units. (US)
- G-Day is the unnamed day on which an order, normally national, is given to deploy a unit. (NATO)
- H-Hour is the specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO)
- I-Day is used informally within the U. S. military bureaucracy to variously designate the "Implementation Day" or the (Delivery Order) "Issuance Day".
- J-Day was used during both world wars  to designate the day an assault (sometimes amphibious ) occurred.
- K-Day is the unnamed day on which a convoy system is introduced or is due to be introduced on any particular convoy lane. A convoy is a group of Vehicles (of any type but usually motor vehicles or ships traveling together for mutual support (NATO)
- L-Hour is the specific time at which deployment for an operation commences. (US)
- L-Day (for "Landing Day") was 1 April 1945, the day Operation Iceberg (the invasion of Okinawa) began . " L-Day " generally refers to April 1, 1945, the day Operation Iceberg the amphibious Invasion of Okinawa, began Events 527 - Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar The Battle of Okinawa, also known as Operation Iceberg, was fought on the Ryukyu Islands of Okinawa and was the largest amphibious assault The Battle of Okinawa, also known as Operation Iceberg, was fought on the Ryukyu Islands of Okinawa and was the largest amphibious assault
- M-Day is the day on which mobilization commences or is due to commence. This article describes military mobilization For other meanings see Mobilization (disambiguation. (NATO)
- N-Day is the unnamed day an active duty unit is notified for deployment or redeployment. (US)
- O-Day is a Maritime Prepositioning Force (MPF, the vanguard of a Marine Air-Ground Task Force, MAGTF) term designating the day the Maritime Propositioning Ship Squadron (MPSRON) off-load begins, or the continuous flow of the Fly-In Echelon (FIE) commences, whichever is later. The Marine Air-Ground Task Force ( MAGTF) is a term used by the United States Marine Corps to describe the principal organization for all missions across the range 
- P-Day is the expected date at which the rate of production of a consumable equals the rate at which the item is required by the Armed Forces. (US)
- Q-Day was 23 June 1945, the day of the dress rehearsal of the first atom bomb test ; nowadays it is sometimes used informally to mean "Quality Day", or the first day of the calendar quarter. Events 1180 - First Battle of Uji, starting the Genpei War in Japan 1305 - The Flemish Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar Trinity was the first test of technology for a Nuclear weapon.
- R-Day is the unnamed day on which redeployment of major combat, combat support, and combat service support forces begins in an operation. (US)
- S-Day is the unnamed day the President authorizes Selective Reserve callup (not more than 200,000 men). (US)
- T-Day is the effective day coincident with Presidential declaration of national emergency and authorization of partial mobilization (not more than 1,000,000 personnel exclusive of the 200,000 callup). (US)
- V-Day is sometimes used to designate "Victory Day", the day an operation successfully concludes.
- V-E Day ("Victory in Europe") designates 8 May 1945, the date when the Allies formally celebrated the defeat of Nazi Germany. Victory in Europe Day ( V-E Day or VE Day) was May 7 and May 8, 1945, the dates when the World War II Allies Events 589 - Reccared summons the Third Council of Toledo 1450 - Jack Cade's Rebellion: Kentishmen Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar Nazi Germany and the Third Reich are the common English names for Germany under the regime of Adolf Hitler and the National Socialist German Workers
- V-J Day ("Victory over Japan") designates 14 August 1945, the date of Japan's acceptance of the unconditional surrender terms. Victory over Japan Day ( V-J Day, also known as Victory in the Pacific Day, or V-P Day) is a name chosen for the day on which the Surrender of Events 1183 - Taira no Munemori and the Taira clan take the young Emperor Antoku and the three sacred treasures Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar
- W-Day is the effective day the President takes the adversary decision to prepare for war (unambiguous strategic warning). (US)
- X-Day was 1 November 1945, the day Operation Downfall (the invasion of Japan) was to begin . X-Day (also codenamed Operation Downfall) a military term that is shorthand for "attack day Events 996 - Emperor Otto III issues a deed to Gottschalk Bishop of Freising which is the oldest known document using the name Ostarrîchi Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar Operation Downfall was the overall Allied plan for the invasion of Japan near the end of World War II. The term also generically means "attack day".
- Y-Day was 1 March 1946, the day Operation Coronet (the invasion of Tokyo Plains) was to occur. Events 86 BC - Lucius Cornelius Sulla, at the head of a Roman Republic army enters in Athens, removing the Tyrant Year 1946 ( MCMXLVI) was a Common year starting on Tuesday (link will display full 1946 calendar of the Gregorian calendar. 
- Z-Day was 10 June 1945, the day the Australian Imperial Forces landed in Brunei Bay to liberate Brunei, part of Operation Oboe Six. Events 1190 - Third Crusade: Frederick I Barbarossa drowns in the Sally River while leading an army to Jerusalem Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar Brunei Bay ( Malay: Teluk Brunei) is the gateway to Brunei and Borneo. Brunei Darussalam, (bruːˈnaɪ in English officially the State of Brunei Abode of Peace (Negara Brunei Darussalam Jawi: برني دارالسلام Operation Oboe Six was the codename for the campaign by Australian forces to retake Brunei and Labuan island from Japanese forces between  
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