Modify Helper times possible?

Hi there,

I would like the helper Utility Counter als measurement for my Gardena Watering system.
Currently I count hourly and daily rainfall with it. I would like to count the rain from 10-18h only to use this as a trigger for my watering system. My problem ist that I cannot configure the counter in that way only 15min, hourly and daily is possible.
Where do I find the configuration to change that?

Best and thanks for your help.

You can reset or calibrate (to zero) your utility meter in an automation triggered by time.

https://www.home-assistant.io/integrations/utility_meter/#services