AFAICT leap seconds are announced about 6 months in advance (January/June). How would you process times that are to occur after a leap second that may or may no

AFAICT leap seconds are announced about 6 months in advance (January/June). How would you process times that are to occur after a leap second that may or may not be? You could store something as '2022-02-02 02:22:22 UTC', but try storing it as seconds since epoch, if you don't know if there will be leap seconds. Not to mention software that may be years or decades old.