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And don't store birthdays of anyone older (currently) than 39. I had a bug where I was enforcing epoch time for birthdates (Why? Long story) It worked when I (born in 1976) tested it, but it totally exploded when my more senior (in years) comrade tested it.

Embarrassing, that one.

Agree, but still be aware of leap seconds. Probably you want to choose to ignore them (as “unix time” does), but know what that means.

And retire before 2038.

And retire before 2038 if you still define time_t as a 32 bit signed integer.