HA sensor entity - change time (timestamp)

[WallyR (Wally)]

Not really possible.
HA saves the values to its database on receiving them regardless of what data there is in the state and attribute fields.

Please vote for this feature request, so we in the future might be able to do it.

Import old energy readings for use in energy dashboard

I am a homeassistant enthusiast since about 4 years and have been using Emoncms now for about 7 years. As homeassistant is now able to show historic energy usage it would be great if I could import historic data into the energy dashboard so that I can kill all legacy systems and have 1 holistic view of my energy consumption. Couldn’t care too much about the way it would allow me to import that data (excel, CSV, SQL) as long as it would be possible.