Solarmeter is uploading 24h per day. PvOutput is filtering the zero values. Problem is that at the end of the day your production is not zero until midnight. The simplest way to solve this is to click on the yellow block below the graph. This will show you
exactly what you want.
The timezone cannot be changed via configuration. Of course it is possible to change it in the source code. You can find it in the time.ino file:
now +=(dst?7200:3600); // CEST or CET
7200 is the number of seconds from GMT to the local summer time (DST)
3600 is the number of seconds from GMT to the local winter time.