Take a look at rfc 2445, specifically section 4.6.5:
The mandatory "TZOFFSETFROM" property gives the UTC offset which is
in use when the onset of this time zone observance begins.
"TZOFFSETFROM" is combined with "DTSTART" to define the effective
onset for the time zone sub-component definition. For example, the
following represents the time at which the observance of Standard
Time took effect in Fall 1967 for New York City:
DTSTART:19671029T020000
TZOFFSETFROM:-0400
The mandatory "TZOFFSETTO " property gives the UTC offset for the
time zone sub-component (Standard Time or Daylight Saving Time)
when
this observance is in use.
Also, I'd take a look at libical, since not every timezone definition
uses COUNT,INTERVAL but some also use BYSETPOS or such. You will need
a complete recurrence parser.
For this specific case, looking at the VTIMEZONE definition, it looks
like Calcutta has no daylight savings time (correct me if I'm wrong).
Now you only need to know the same information for PST, then you can
calculate the offset.
Philipp
On Aug 21, 7:12 am, Kulvinder Singh <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I am fetching data from my Google calendar with many of the events a
> Recurring. My current Google Calendar is in IST (i keep this changing when i
> move across countries) but my machine is in PST and one of my Recurring
> events are of the form :
>
> <gd:recurrence>DTSTART;TZID=Asia/Calcutta:20070807T080000
> DTEND;TZID=Asia/Calcutta:20070807T093000 RRULE:FREQ=DAILY;COUNT=20;INTERVAL=1
> BEGIN:VTIMEZONE TZID:Asia/Calcutta X-LIC-LOCATION:Asia/Calcutta
> BEGIN:STANDARD TZOFFSETFROM:+0530 TZOFFSETTO:+0530 TZNAME:IST
> DTSTART:19700101T000000 END:STANDARD END:VTIMEZONE</gd:recurrence>
>
> Now, the question is how do i parse the above string to convert this into a
> Recurring event on my machine ? I actually want to know that the above
> information suggests that TZID for my event is Asia/Calcutta and time (local)
> in google calendar is 8:00 AM. How do i know which time it is in PST ?
>
> I want to get the UTCoffset in which my event was created so that i can
> easily convert to its equivalent time on my machine. Do i have to read whole
> of the information in this Recurrence string ? Is there any simpler way of
> doing that ?
>
> Thanks
>
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