Re:FAA Issues National Ground Stop
by agildehaus on Friday November 13, 2026 @05:28PM
(#50490947)
It's a format called "Date-Time Group" (DTG). Used in military, I think it dates back to teletypes, and is better to say over radio than modern ISO formats.
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Re:FAA Issues National Ground Stop
by bmurray7jhu on Friday November 13, 2026 @06:29PM
(#50491645)
The TLDR is that punchcard operators found DTG date format convenient. Punchcard sorting is easiest when the consecutive bits encode the sort key, and the DTG format is easy to split into different sets of bit ranges corresponding to common business logic.