[Tickets #12256] "Add to my calendar" does not work with non-standard timezones

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Ticket URL: http://bugs.horde.org/ticket/12256
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  Ticket             | 12256
  Created By         | janne.peltonen at helsinki.fi
  Summary            | "Add to my calendar" does not work with non-standard
                     | timezones
  Queue              | Horde Groupware Webmail Edition
  Version            | 5.0.4
  Type               | Bug
  State              | Unconfirmed
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             |
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janne.peltonen at helsinki.fi (2013-05-15 13:34) wrote:

If I receive a calendar invitation from, say, Lotus Notes of Microsoft  
Outlook, with TZID, say, "FLE", and click  "Add to my calendar" ,I get  
the error DateTimeZone:__construct(): Unknown or bad timezone. And  
well, so it should: the time zones that DateTimeZone knows about can  
be looked up from php.net, and they don't contain the "FLE" time zone.

On the other hand, if I save the attached ICS file in the invitation  
(containing the TZ info) and Import it into Kronolith, everything  
works perfectly.

Is it possible for the code that implements the "Add to my calendar"  
functionality should use the same code as the ICS file importing code?