Utility Meter should allow setting a yearly offset on a specific day

[RezzZ]

Home Assistant release with the issue:
0.87.0

Last working Home Assistant release (if known):

Operating environment (Hass.io/Docker/Windows/etc.):
RPi3b+, raspbian stretch (up to date), docker
Component/platform:
utility_meter

Description of problem:
I just enabled the new utility_meter:
https://www.home-assistant.io/components/utility_meter/
and want to set the offset for the yearly sensors to May 11th.

According to @dgomes (who was kind enough to reply awesomely quick here (#19718 (comment)) the offset for yearly sensors is the nr of months.
Unfortunately in the Netherlands cycles never start on the 1st of a month (unless you actually buy a house on the 1st of a month and start your energy contract at that date). Did I misunderstand of can we actually set a specific day of a year for the offset cycle? like daynr?

[pilievwm]

Hi @RezzZ
So what if I need to reset it on 15th every month? What should i add to the offset?

[dgomes]

Currently you use 15

[pilievwm]

Thanks @dgomes ! And one more question.
My source is current power in kWh which is constantly changing based on the usage.
If I use it the utility meter is going crazy and shows me that for 10 minutes my usage is more than 20kWh :)
What source do you use? current power consumption or aggregated? My electricity sensor is pzem004

[dgomes]

The utility_meter source MUST be an energy value (therefore expressed in kWh)

I would use "Energy Total"

[pilievwm]

Sorry for all the question!
Do i have to add it like this?

offset: days: 15

or

offset: 15

It is not very clear into the description

[dgomes]

currently:

offset: 15

If my PR gets merged (fixing this issue):

offset:
  - days: 15

[pilievwm]

I am converting the current power usage into kWh and it is energy value, but it is changing all the time (based on my consumption).
Energy total will reset on a specific time of the day. It is built-in feature of the pzem004

[dgomes]

Take my word, use Energy Total.

If you setup a daily utility_meter the values in "Energy Today" and "Energy Yesterday" will hopefully be the same, proving that the utility_meter is working correctly.

Even if the energy total resets, you will lose a very small amount of energy account .

[pilievwm]

Ok thanks for that info!

[pilievwm]

And last ... promise!
Do i have to set automation to reset the values every month on 15th?

[dgomes]

no, that's the all point of utility_meter, it resets for you

[pilievwm]

Awesome!