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 " (UTC)"; while another example is "".
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
transmission
Transmission may refer to:
Medicine, science and technology
* Power transmission
** Electric power transmission
** Propulsion transmission, technology allowing controlled application of power
*** Automatic transmission
*** Manual transmission
*** ...
facility
Facility may refer to:
* A place for doing something, or a place that facilitates an activity:
** A commercial or institutional building, such as a hotel, resort, school, office complex, sports arena, or convention center
** Medical facili ...
by a
user
Ancient Egyptian roles
* User (ancient Egyptian official), an ancient Egyptian nomarch (governor) of the Eighth Dynasty
* Useramen, an ancient Egyptian vizier also called "User"
Other uses
* User (computing), a person (or software) using an ...
or originator for dispatch.
The DTG may be used as a message
identifier
An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique ''class'' of objects, where the "object" or class may be an idea, physical countable object (or class thereof), or physical noncountable ...
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:
* - Full time (used for software timestamps)
* - shortened time (used e.g. for timestamps manually written)
* - short time (e.g. used for planning)
references the military identifier of time zone:
*
UTC-12: Y (e.g., Fiji)
*
UTC-11: X (American Samoa)
*
UTC-10: W (Honolulu, HI)
*
UTC-9: V (Juneau, AK)
*
UTC-8: U (
PST, Los Angeles, CA)
*
UTC-7: T (
MST, Denver, CO)
*
UTC-6: S (
CST, Dallas, TX)
*
UTC-5: R (
EST, New York, NY)
*
UTC-4: Q (Halifax, Nova Scotia)
*
UTC-3: P (Buenos Aires, Argentina)
*
UTC-2: O (Godthab, Greenland)
*
UTC-1: N (Azores)
*
UTC+-0: Z (
Zulu time)
*
UTC+1: A (France)
*
UTC+2: B (Athens, Greece)
*
UTC+3: C (Arab Standard Time, Iraq, Bahrain, Kuwait, Saudi Arabia, Yemen, Qatar)
*
UTC+4: D (Used for Moscow, Russia, and Afghanistan, however, Afghanistan is technically +4:30 from UTC)
*
UTC+5: E (Pakistan, Kazakhstan, Tajikistan, Uzbekistan, and Turkmenistan)
*
UTC+6: F (Bangladesh)
*
UTC+7: G (Thailand)
*
UTC+8: H (Beijing, China)
*
UTC+9: I (Tokyo, Japan)
*
UTC+10: K (Brisbane, Australia)
*
UTC+11: L (Sydney, Australia)
*
UTC+12: M (Wellington, New Zealand)
Examples
Example 1: represents the 5th day of the current month 11:00 (UTC).
Example 2: represents 09th July 2011 4:30 pm (MST).
Example 3: represents the current time of refresh: (UTC).
“Zulu time” does not mean “local time” unless a Zulu time zone is specified. Earth rotates in 24 hours, thus there are 24 hours in a day. The English alphabet has 26 letters; J is local time, and the other 25 letters are assigned to the 25 time zones. The International Date Line separates time zones M and Y. Zulu
is a synonym for Coordinated Universal Time (UTC); and formerly a synonym for Greenwich Mean Time (GMT).
[Egeland PhD, Dr Knut Normann, et al (2021: p. 3). “Military Date Time Group - MIL DTG DDHHMMSSZmmmYY”, archived in Military Academy, private Knights University (Ko’G).]
Sources
MIL-STD-2500A 12 October 1994
See also
*
Calendar date
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 " is ten days after " ...
*
ISO 8601
шхдП
References
*TM 20-205, the Dictionary of United States Army Terms (1944)
*ACP 121(I) p 3–7
External links
{{DEFAULTSORT:Date-Time Group
Calendars