Nik Everett dfd502f9ca
Rework checking if a year is a leap year (#60585) (#60790)
This way is faster, saving about 8% on the microbenchmark that rounds to
the nearest month. That is in the hot path for `date_histogram` which is
a very popular aggregation so it seems worth it to at least try and
speed it up a little.

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
2020-08-10 12:45:34 -04:00
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