Difference between two values

@pitp2 wrote:

Hi,
I would like to subtract two values. The first value should be the value of a sensor at 20:00 and the second one the value at 09:00.
The subtraction will be calculated at 20:00.
The automation is not the problem but I don’t know wich template I could use to get a value of the sensor at a precise date and time.

Could you help me ?

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