We have about a dozen customers with a couple of recurring appointments that are one hour off during the new Pacific DST. The same appointment is correct in November 2010. Any ideas why the time would be off 1 hour in March 2010 for 3 weeks but is accurate in November 2010. Both months had modifications made to the start/end date/time. The same problem exists in 2011 as well with March being off 1 hour for 3 weeks and November being accurate.