String[] projections = new String [] {
    WorldClock.Columns.CITY_UID,
    WorldClock.Columns.NAME,
    WorldClock.Columns.LONGITUDE,
    WorldClock.Columns.TIMEZONE
}

String selection = WorldClock.Columns.TIMEZONE + " = '?'";

String[] selectionArgs = new String[] {"Asia/Tokyo"};

// Sort data by WorldClock.Columns.CITY_UID
Cursor cur = WorldClock.query(getContext().getContentResolver(),
                              projections,
                              selection,
                              selectionArgs,
                              WorldClock.Columns.CITY_UID
                            );

while (cur.moveToNext()) {
    WorldClock.Location wlc = WorldClock.getLocationFromCursor(cur);

    // Do something useful with the value.
}