chronat: Add duration formatter #1861
Merged
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Special specifiers for duration are
j q Q.Otherwise duration is very similar to
hh_mm_ssexcept that times areinterpreted as time from midnight. I thought this would mean that
negative times are yesterday, but we just append a
-instead, whichmeans we should round towards zero (i.e. truncate or
duration_cast)instead of flooring to a day when computing hh/mm/ss.
Other behavior is pretty simple.