Are there any apps (or is it even possible) that would turn a device on/off, but only during a specified date range? I.e. a light turns on or off at a specified time or due to other trigger, but only if it is within a certain date range (like Nov 1 through Mar 31)? I’ve not dug into Core yet, so I don’t know if it is possible using that either. If so, I might need to invest some time learning it…
WebCoRE (CoRE upgrade) is your best bet I think. Fantastic app!
Definitely webcore FTW on this.
If you just have one or two things that you want to set up, maybe like Christmas lights coming on In December, it is possible to use the Google calendar service/channel on IFTTT to trigger a virtual switch in smartthings and then use that to start a routine or other smartthings – controlled events.
The webcore option will give you many more choices and is much more powerful, but the IFTTT option is worth knowing about.