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MySQL 5.7 Reference Manual
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Excerpts from this Manual Replication and Time Zones

By default, master and slave servers assume that they are in the same time zone. If you are replicating between servers in different time zones, the time zone must be set on both master and slave. Otherwise, statements depending on the local time on the master are not replicated properly, such as statements that use the NOW() or FROM_UNIXTIME() functions.

Verify that your combination of settings for the system time zone (system_time_zone), server current time zone (the global value of time_zone), and per-session time zones (the session value of time_zone) on the master and slave is producing the correct results. In particular, if the time_zone system variable is set to the value SYSTEM, indicating that the server time zone is the same as the system time zone, this can cause the master and slave to apply different time zones. For example, a master could write the following statement in the binary log:

SET @@session.time_zone='SYSTEM';

If this master and its slave have a different setting for their system time zones, this statement can produce unexpected results on the slave, even if the slave's global time_zone value has been set to match the master's. For an explanation of MySQL Server's time zone settings, and how to change them, see Section 5.1.13, “MySQL Server Time Zone Support”.

See also Section, “Replication and System Functions”.