MySQL Bugs: #66678: convert_tz inconsistency -- convert_tz returns null when it should work

On both MySQL 5.1.63 and 5.5.23 (Windows 7, Danish) I get the result: SYSTEM Rom, sommertid (NULL) (NULL) .. with the modified query: SELECT @@global.time_zone, @@global.system_time_zone, CONVERT_TZ(NOW(),@@global.time_zone, 'US/Central ...

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