Military designation of days and hours

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, as follows:

Related Topics:
North Atlantic Treaty Organisation - AAP - STANAG

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• D-Day is the 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.
• E-Day is the day on which a NATO exercise commences.
• G-Day is the day on which an order, normally national, is given to deploy a unit.
• K-Day is the day on which a convoy system is introduced or is due to be introduced on any particular convoy lane.
• M-Day is the day on which mobilization commences or is due to commence.
• H-Hour, finally, 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).