Gary Pendergast b9cd66f483 Formatting: Add support for seconds to human_time_diff().
The web has gotten so much faster since `human_time_diff()` was created, we need to be able to measure time differences with much finer granularity. Now, we can.

Props johnjamesjacoby, pento.
Fixes #35655.



git-svn-id: https://develop.svn.wordpress.org/trunk@45573 602fd350-edb4-49c9-b593-d223f7449a82
2019-06-28 06:43:27 +00:00
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