[Tickets #7156] Re: Daylight Savings to Standard Time Transition recurring events in ics subscriptions

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Ticket URL: http://bugs.horde.org/ticket/7156
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  Ticket             | 7156
  Updated By         | elliot at marlboro.edu
  Summary            | Daylight Savings to Standard Time Transition recurring
                     | events in ics subscriptions
  Queue              | Kronolith
  Version            | 2.2
  Type               | Bug
  State              | Assigned
  Priority           | 2. Medium
  Milestone          |
  Patch              |
  Owners             | Horde Developers
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elliot at marlboro.edu (2008-10-12 19:07) wrote:

I'm doing a bit more investigation into solving this, it looks like  
sending timezone specific times instead of UTC time solves the issue  
in Sunbird at least.
The following shows up at 1pm through the transition

DTSTART;TZID=America/New_York:20081001T130000
DTEND;TZID=America/New_York:20081001T140000

Sunbird additionally adds some information about the timezone to it's  
ics file, though it appears to know enough about my location that if  
horde didn't include the following the events would still be timed  
correctly.

BEGIN:VTIMEZONE
TZID:America/New_York
X-LIC-LOCATION:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:19700308T020000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=2SU;BYMONTH=3
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:19701101T020000
RRULE:FREQ=YEARLY;INTERVAL=1;BYDAY=1SU;BYMONTH=11
END:STANDARD
END:VTIMEZONE