Off limit display rules and time counter

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Hi there,

I have an air quality sensor giving me temperature, humidity and CO2 concentration. limits have been set for good air quality,
I need to realise 2 functions:
- when the variable goes off limit, the font colour needs to change to red
- I need to display for each the number of hour each year the variable was off limits, and reset it on Jan 1st.

Have you done something similar?

Thanks!