...it's not quite the same as the "old" basic programming from 30 years ago....
You can say that again.
Unfortunately the holiday settings only seem to be only for a single date range. eg. Chanukah is 12/19-12/26 on my system. Was that for 2005? You can edit the ranges under preferences. eg. I have Christmas begin late Nov and go through the 1st week in Jan for my lighting.
I wanted to have a holiday called "School Holidays" with all of the days off included.
Also with respect to X10 the day always begins at 12:00:01 am. So for any holiday that begins in the evening, you will need to use 2 dates. eg New Years Eve is 12/31 - 1/1
X10: Are the non constant dates such as Easter and many of the Jewish holidays updated and downloaded to the CM15A like DST dates?