This is madness. I have never heard anyone say they're meeting someone on the 1st of the/a 9th....etc. Any of those. Never.

Sure, people would spell it out: I'm seeing someone on the ninth of September.

Or : I'm seeing everyone on the ninth of September in '03 (or 'in two thousand three')...

But never: "I'm seeing Jackie and everybody else on the first of the ninth..." where 9th means a month.

Closest I can get to this (while my head nods and I need to get to sleep) would be my response to an agency for a date. I might say, "O-eight; O-twenty-four; forty-two," for example, for August 24, 1942, but I'd have to be pretty sure that the person on the other end was filling in blanks and was accumstomed to translating dates this way.

Oh, well. It's probably lack of sleep at this point, but those examples up there I've never heard people use in everyday speech.

FTR,
WW