Most people don;t know what GMT is, and a lot don;t even know there are different time zones. Most of those people seem to reside in Washington, DC!
Yep. When I was in Tehran, every teletype communications to and from other stations always ended in my call sign “OGIE” followed by the 24 hour time format.
DOTL . . . .OGIE 1634ZULU (Date OF Time Log)