The timezone setting is maintained in the mysqlauth.php file.
//################### Set Your System TimeZone
####################
date_default_timezone_set('America/New_York');
/*
Update the value with the variable representing the timezone
you want Ad Peeps to calculate statistics, scheduling based on.
Examples:
America/New_York = Eastern Standard
America/Los_Angeles = Pacific Time
America/Denver = Mountain Daylight Time
List can be found at: http://php.net/manual/en/timezones.php
*/
//################### Set Your System TimeZone
####################
