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In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC). The order in which these elements are presented may vary. The DTG is usually placed in the header of the message. One example is "04:59 Sep 19, 2021 (UTC)"; while another example is "04:59 19 Sep 2021".
The DTG may indicate either the date and time a message was dispatched by a transmitting station or the date and time it was handed into a transmissionfacility by a user or originator for dispatch.
The DTG may be used as a message identifier if it is unique for each message.
Military Date Time Group
A form of DTG is used in the US Military's message traffic (a form of Automated Message Handling System). In US military messages and communications (e.g., on maps showing troop movements) the format is DD HHMM (SS) Z MON YY. Although occasionally seen with spaces, it can also be written as a single string of characters. Three different formats can be found:
DDHHMMSSZmmmYY - Full time (used for software timestamps)
DDHHMMZmmmYY - shortened time (used e.g. for timestamps manually written)
DDHHMMZ - short time (e.g. used for planning)
Z references the military identifier of time zone: