Syntax:
CONVERT_TZ(dt,from_tz,to_tz)

CONVERT_TZ() converts a datetime value dt from the time zone given by
from_tz to the time zone given by to_tz and returns the resulting
value. Time zones are specified as described in
http://dev.mysql.com/doc/refman/5.1/en/time-zone-support.html. This
function returns NULL if the arguments are invalid.

URL: http://dev.mysql.com/doc/refman/5.1/en/date-and-time-functions.html

