WordPress essentially completely ignores native PHP date functionality, in favor of its own handling. That traditionally allowed it to manage related aspects (such as timezones and translation) with no regards for server configuration.
My educated guess that it would be largely oblivious to such change. At most the cron tasks might fire in bulk and some forms might fail due to nonces (which are valid for many hours, so probability of less than an hour shift affecting them is low).
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