@egdod,

Normally a reboot will force the device to synchronize the time. I believe that some devices do receive their time settings from the router's time, rather than from the Kasa service, so you may try and make sure that the time zone settings for your network is also set correctly.

I would also recommend trying to choose a similar time-zone to see if the behavior is limited to that specific zone. For most time zones, there should be a few different options that will all give the same time. You may even simply try toggling the time zone to a different area and back to see if the change will force the sync.