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In page Date-time group:

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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).[citation needed] The order in which these elements are presented may vary. The DTG is usually placed in the header of the message. One example is "17:15 Jul 15, 2025 (UTC)"; while another example is "17:15 15 Jul 2025".