Add timezone support about ics-parser

[u01jmg3]

For your issue, I don't believe a new class is required. If one event is missing from your occurrence rule when UNTIL is used in combination with a timezone then perhaps that is what you should look to fix.

Both timezone and daylight saving information is available globally. Perhaps this just needs to be incorporated within processRecurrences().

[u01jmg3]

Your issue may have been fixed with 15ad353

[grimmlink]

Hi,

I have a related situation with timezones.
One of my calendar contains recurrent events that have been created with Europe/Paris TZ during DST (summer time). The weekly event looks like this:

BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20160921T080000
DTEND;TZID=Europe/Paris:20160921T090000
RRULE:FREQ=WEEKLY;BYDAY=WE
DTSTAMP:20161117T165045Z
UID:[email protected]
CREATED:20160920T133918Z
DESCRIPTION:
LAST-MODIFIED:20160920T133923Z
LOCATION:
SEQUENCE:1
STATUS:CONFIRMED
SUMMARY:---------
TRANSP:OPAQUE
END:VEVENT

Start time is 8am in Paris TZ (2 hours offset with UTC is 6am).
Problem is now that the DST is finished we are back to a 1 hour offset but this is what I get from the parser: 20161116T060000Z instead of 20161116T070000Z

Any ideas?
I'll try to work on a PR as I may have a lead with http://php.net/manual/datetimezone.gettransitions.php

[u01jmg3]

Off the top of my head I do not know nor have I seen this before. Happy to accept a PR if you figure out the problem.

[grimmlink]

The problem is that the DTSTART is converted to timestamp before to manage the recurrences
so DTSTART;TZID=Europe/Paris:20160923T153000 becomes 2016-09-23 13:30:00 in unix time

Then there is no way to know in the processRecurrences function if the first occurrence of the event was created during DST or not

PR: #94