To be clear: It's not the "correct" wall clock time for most people's day to day use, because it only counts seconds that have elapsed since 1st Jan 1970 00:00

To be clear: It's not the "correct" wall clock time for most people's day to day use, because it only counts seconds that have elapsed since 1st Jan 1970 00:00 (in a continuous unbroken manner), and does not count leap seconds (which are added to keep our daily-use times in sync with the rotation of the earth.) Isn't time fun?