Как правильно записать в template.php фунцию

function _system_zonelist() {
$timestamp = time();
$zonelist = array(-11, -10, -9.5, -9, -8, -7, -6, -5, -4.5, -4, -3.5, -3, -2.5, -2, -1, 0, 1, 2, 3, 3.5, 4, 5, 5.5, 5.75, 6, 6.5, 7, 8, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.75, 13, 14);
$zones = array();
foreach ($zonelist as $offset) {
$zone = $offset * 3600;
$zones[$zone] = format_date($timestamp, 'custom', variable_get('date_format_long', 'l, F j, Y - H:i') .' O', $zone);
}
return $zones;
}