> 2007年05月01日T11:30:15Z-08:00 I think that is incorrect, as it is an either-or. The timezone is: * omitted, therefore local timezone * Z, therefore UTC * +/-HH:MM, therefore an offset from UTC The W3C page on date/time formats (<http://www.w3.org/TR/NOTE- datetime>) says: > TZD = time zone designator (Z or +hh:mm or -hh:mm) Also see <http://www.cl.cam.ac.uk/~mgk25/iso-time.html#zone> for more notes on the ISO standard. -- Norm.