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Re:Show HN: Convier.me – A Calendar Service for Developers by jagged-chisel on Sunday January 10, 2021 @08:23AM (#25714434)
I just use noon and midnight to reduce ambiguity

11:59pm, midnight, 12:01am

11:59am, noon, 12:01pm

Re:Show HN: Convier.me – A Calendar Service for Developers by ValentineC on Sunday January 10, 2021 @10:06AM (#25715285)
"Midnight" doesn't solve the second part of GP's problem:

> In addition to the confusion about whether 12 PM is 00:00 or 12:00, there’s confusion about which calendar day 12 AM falls on. When does a Friday midnight movie start? 99.9% of people will show up at the end of Friday, but in a literal user interface you’d have to choose 12 AM Saturday.

I use 11:59pm or "end-of-day" for most cases.