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Reservation systems are built on top of very old systems.

One date format that is standard is 25DEC19. It probably made sense for humans entering «cryptic commands» (yes that is the term)

That should be 1925dec19 (or 19dec1925 if you like little-endian), otherwise year vs day is ambigous.

Not between XX32 and XX00 as per last century.

I think the past two decades have made it clear that that's a unacceptably brittle system.