@wheindl you can set a WU trigger on IFTTT and set your location eastward for earlier or westward for later triggers. Use maps to figure out what longitude you're on then add or subtract 1 for an offset of 4 minutes. There's 4 minutes between each longitude. 

@Moderator_Edwa Dynamic sunset time is the standard for Smartlife app. Would Kasa implement this feature?

@jarrettm They have finally added this!  At least in my HS200 switches.  (had to force a firmware update to get the ability)

With that being said, I am pretty disappointed that the offset is limited to + or - an hour.  I think for most folks use cases this is OK, but I don't understand why the artificial limit (other than making the UI simpler).