Saving Time Zone offsets TADvCalDav


The TAdvvCalendar reads in all the time zone off-set properties (Standard and Daylight) from an event. 

However, if you create a new event and set all the vEvent[0].vTimeZone.Standard or Daylight properties they are not set back to the server. The SaveToStream function seems to only write the TimeZone name and not the offsets

Any reason why 

Thanks in advance