Convert moment(..., "X") to moment.unix(...) (#2950)

because I thought it was more readable and I found a little bug when
calculatin suntimes on the way....

Co-authored-by: veeck <michael@veeck.de>

CHANGELOG.md

@@ -28,6 +28,7 @@ Special thanks to: @rejas, @sdetweil
 - Updated da translation
 - Rework weather module
   - Use fetch instead of XMLHttpRequest in weatherprovider
+  - Use unix() method for parsing times, fix suntimes on the way
 
 ### Fixed