I'm trying to get more information. I'm not sure, but I tend to suspect that the Activity Planner uses "local time" - as in it's not time zone aware. The main calendar IS time zone aware. There have been problems with the calendar in the past with Daylight savings. Typically they show up when "current time" is standard and the activity is during DST or the other way around. As such, I suspect the issue isn't with the Activity Planner itself as much as it's either a calendar issue (and the use of the planner is irrelevant) or with the connector used to hand off the event to the calendar.
So I'm trying to ascertain when the activity was placed on the calendar (ST or DST?) and when is the activity itself scheduled for (ST or DST?). Do you get different results depending on the date of the scheduled activity? Do you get different results now that the US has switched to Standard Time? That would be evidence that the problem is a DST issue, not a MT/PT issue.
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