What is the correctly stated date-time group (DTG) assigned to the message released at 1930 hours Greenwich Mean Time on 2 January 1991?

The correct date-time group (DTG) format follows a specific structure that includes the day, hour, minutes, and a relevant time zone indicator. In this case, the message was released at 1930 hours (7:30 PM) on the 2nd of January, 1991, with Greenwich Mean Time (GMT) as the reference time.

The proper format for the DTG involves stating the day first, followed by the hour and minutes, and then the month and year. So, in the given scenario, the day "02" comes first, followed by the time "1930", and given in a single format with the time zone “Z” for Zulu time, indicating UTC/GMT.

Hence, the date-time group is correctly structured as "021930Z JAN 91". This format ensures that the date and time are clear, enabling anyone reading it to understand the exact moment the message was released without ambiguity regarding the date and time zone.