DTSTART _is_ inclusive. So DTSTART 13:00:00, DTEND 13:00:01 contains exactly one second: 13:00:00.
However the clock time of 13:00:01 is not included in the appointment. So the clock time for the appointment is 13:00:00 -> 13:00:00 which is a DURATION of 0 seconds.
Doug Royer | http://INET-Consulting.com
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