Setting timezone to CET and running tests/auto/qdatetime will result in skipped tests as current implementation of QDateTime for Symbian is missing DST component completely.

tst_QDateTime::tst_QDateTime()
{
    uint x1 = QDateTime(QDate(1990, 1, 1), QTime()).toTime_t();
    uint x2 = QDateTime(QDate(1990, 6, 1), QTime()).toTime_t();
    europeanTimeZone = (x1 == 631148400 && x2 == 644191200);
}

x2 != 466191200 since it misses 1 hour or 3600 seconds from DST making the decision point of the test also invalid as there is no tests run for DST if this check fails.