Yanqin Jin e79df377c5 Use chrono::time_point instead of time_t (#4868)
Summary:
By convention, time_t almost always stores the integral number of seconds since
00:00 hours, Jan 1, 1970 UTC, according to http://www.cplusplus.com/reference/ctime/time_t/.
We surely want more precision than seconds.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4868

Differential Revision: D13633046

Pulled By: riversand963

fbshipit-source-id: 4e01e23a22e8838023c51a91247a286dbf3a5396
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