What does the 'D' in D-Day stand for?

Question

is it a military term?

Answer 1

It has a few meanings, some say is "Demarcation day", other say it was "Debarcation Day" while others say it was "Decimal Day" or just "Day-Day"; here's a list of all Military designation of days and hours:

A-Day was 20 October 1944, the day the Leyte Island Operation (the invasion of Leyte) began.

C-Day is short for "Candy 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 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. 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. (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.

M-Day is the day on which mobilization commences or is due to commence. (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.

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.

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.

V-­J Day ("Victory over Japan") designates 14 August 1945, the date of Japan's acceptance of the unconditional surrender terms.

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 Olympic (the invasion of Japan) was to begin. 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.

Z-Day was 10 June 1945, the day the Australian Imperial Forces landed in Brunei Bay to liberate Brunei, part of Operation Oboe Six.

Answer 2

The 'D' stands for day. D-day is the start date of an operation, H-hour is the start time of the operation. Operation overlord, the invasion of Nazi-occupied France, began on June 6, 1994. Therefore, D-day is June 6, 1944. H-hour was to be the early hours of June 6, but some British paratroopers actually landed before midnight, June 5.

Answer 3

D-Day is the date set for an invasion or commencement of a military action on the ground. It begins at H-hour. The two terms are used to mark the time which has passed since the original D-Day and H-Hour. In the first (or D-Day) it would be H+1, H-4, etc. When marked in days it would be D-4, etc. Similarly, the times before would be D-3, H-5, etc.
For strictly aerial operations, like those in the initial phases of Operation Desert Storm and Operation Allied Force ( the campaign in Kosovo), the equivalent would be A-Day and A-Hour.

Answer 4

D-Day basicly means THE Day something happens also like H-Hour

Look at the space shuttle T-100s is like Take off -100 seconds.

so a week before d day would be D-Day-7 days then a week after would be D-Day+7 days

Answer 5

D-day and H-hour are general terms used for the day and hour on which an operation is to be initiated. D stands for the day the combat operation started

Answer 6

Try 'duh!' or 'dude'.

The D as in D-Day has no special meaning, except that historically it has become attached to '[D-Day 6th of June 1944]' the Invasion of Normandy by the Allies.

d day
http://www.dday.co.uk

Answer 7

D-Day is a term often used in military parlance to denote the day on which a combat attack or operation is to be initiated. "D-Day" often represents a variable, designating the day upon which some significant event will occur or has occurred; see Military designation of days and hours for similar terms. The initial D in D-Day has had various meanings in the past, while more recently it has obtained the connotation of "Day" itself, thereby creating the phrase "Day-Day."

Answer 8

it means nothing other than it has came to mean the day for a planned attack to commence. h-hour is the hour of the planned attack.
you can use a-day as MacArthur was fond of doing in the Pacific to distinguish his planned assaults from everyone Else's.

Answer 9

D for Day
H for Hour
Y for Year...and so on...

Answer 10

Demob day when your two years were up.