<chrono>: Fix utc_clock seconds formatting #1868
Merged
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Seconds were being formatted incorrectly because we incorrectly assumed
that a day is
24*60*60
seconds (which is what flooring does) when inreality they aren't always (like if there was a leap second). This error
compounds over time as leap seconds are inserted, so we need to add the
elapsed leap seconds at any given time point to get the correct seconds.
This issue doesn't affect the
tm
structure because it is constructedout of a system time (
utc_clock::to_sys
), which has24*60*60
seconddays.