Programming dates and times is far more involved than the naive see. [Provide examples.]

These Reddit comments mention valuable details about UTC, UT1R, UT2, UT2R, TAI, ..., timezones, GPS, ... All this is in response to a modest "write-up on programming practices involved in time.

"Falsehoods Programmers Believe About Time"

Cameron Laird's personal notes on datetime programming/