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TZID:EST
BEGIN:STANDARD
DTSTART:20000101T000000
RRULE:FREQ=YEARLY;BYMONTH=1
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TZOFFSETFROM:-0500
TZOFFSETTO:-0500
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BEGIN:VEVENT
UID:20261012T201916Z - 57967@165ff255b7c4
DTSTART;TZID=EST:20170411T090000
DTEND;TZID=EST:20170411T120000
CREATED:20261012T201916Z
DTSTAMP:20261012T201916Z
LOCATION:My Company
SUMMARY:IonActive System Treatment workshop
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END:VCALENDAR