[CalendarLink] Anchor timed events to their time zone with TZID and VTIMEZONE - #3818
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…TIMEZONE IcsBuilder converted every timed value to UTC and emitted no VTIMEZONE, so a recurring event in a DST zone drifted by an hour for half the year (RFC 5545 expands RRULE in the DTSTART zone). Serialize named zones as local time with ;TZID= plus a generated VTIMEZONE carrying the yearly DST rules; UTC and fixed offsets keep the lossless ...Z form. Closes symfony#3811
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IcsBuilderconverted every timed value to UTC and emitted no VTIMEZONE, so a recurring event in a DST zone drifted by an hour for half the year (RFC 5545 expands RRULE in the DTSTART zone).Serialize named zones as local time with ;TZID= plus a generated VTIMEZONE carrying the yearly DST rules; UTC and fixed offsets keep the lossless ...Z form.