Sunset triggers not firing

Hi. My sunset triggers are not firing. Looking at my location setting my time zone is blank. How can I update the time zone?

Confirm location is setup correctly
go to three horizontal bars (lower right)
go to select a location, and select settings (gear in upper right)
ensure the location is correct, and hit “Done”

you might also go into the IDE, My Locations -> select your location -> List smart apps

and select update next to “Weather Station”

Thanks for your help. The location wasnt correct in the hub settings. I removed the location and re-added. This means i’ve had to start all over again!!#

Now i cant get my 3rd party sensors to re-add to the hub!!