fix(date): improve caching accuracy #3887
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`CachedDate` gets updated every second, but the current logic doesn't take into account milliseconds - if the application starts at `12:00:00.600`, hyper will report `date: ...T120000` up until `12:00:01.599`, which is overzealous. We can sidestep this by subtracing the nanoseconds part (which includes milliseconds) from the time passed to `CachedDate::update()`.
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CachedDategets updated every second, but the current logic doesn't take into account milliseconds and nanoseconds - if the application starts at12:00:00.600, hyper will reportdate: ...T120000up until12:00:01.600, which is overzealous.We can sidestep this by subtracting the nanoseconds part (which includes milliseconds) from the time passed to
CachedDate::update(), essentially roundingself.next_updateto the beginning of the next closest second.