RFC 5545, "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", September 2009

Note: This RFC has been updated by RFC 5546, RFC 6868, RFC 7529, RFC 7953, RFC 7986, RFC 9073, RFC 9074, RFC 9253

Errata ID: 3883
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Bruce Florman
Date Reported: 2014-02-05
Verifier Name: Barry Leiba
Date Verified: 2014-02-14

Section 3.8.5.3 says:

      Every 3 hours from 9:00 AM to 5:00 PM on a specific day:

       DTSTART;TZID=America/New_York:19970902T090000
       RRULE:FREQ=HOURLY;INTERVAL=3;UNTIL=19970902T170000Z

       ==> (September 2, 1997 EDT) 09:00,12:00,15:00

It should say:

      Every 3 hours from 9:00 AM to 5:00 PM on a specific day:

       DTSTART;TZID=America/New_York:19970902T090000
       RRULE:FREQ=HOURLY;INTERVAL=3;UNTIL=19970902T210000Z

       ==> (September 2, 1997 EDT) 09:00,12:00,15:00

Notes:

The UNTIL rule part is specified with UTC time, which was four hours ahead of America/New_York on 19970902. So 170000Z would only be 1:00 PM on that day.

The corrected UNTIL rule matches the description (from 9 to 5). Note that "UNTIL=19970902T190000Z" would have the same effect (the last event is at 3 PM in New York, which is 19:00 Z), but 21:00 Z is what matches the description.

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