I recent signed up to the virtual meter which is great as I can now see the inverter generation as well as the net grid flow at the same time.

However, I suspect there may be a time zone difference between the the inverter and grid as the inverter history seems to lag by 1 hour - possible due to DST. 

How can I fix this without pretending I'm not on DST?

Time zones and daylight saving rules are based on the settings of the place and are independent of the original time data of the inverter. If they are in the same place, they will definitely be the same. If they are in different places, please ensure the settings are consistent. 

If you still have questions, please provide detailed screenshots for clarification.