The same system time zone should be set for both master and slave. Otherwise, some statements will not be replicated properly, such as statements that use the NOW() or FROM_UNIXTIME() functions. You can set the time zone in which MySQL server runs by using the --timezone=timezone_name option of the mysqld_safe script or by setting the TZ environment variable.

Starting with MySQL 4.1.3, both master and slave should use the same default connection time zone. That is, the --default-time-zone parameter should have the same value for both master and slave. However, if the master runs MySQL 5.0 or later, this is not necessary.

CONVERT_TZ(...,...,@@global.time_zone) is not properly replicated.