Nibe Heat Pump - periodic_hot_water_40066

I can’t figure out the “unit/format” of the register periodic_hot_water_40066 coming from an Nibe s320 (configured for 14 days periodic hot water).

I would like for the integration to show a human readable date. But this is some data that the register has outputted:

Register value  -  date shown on the display
    5108        -  2023-12-27 
    5122        -  2024-01-10 
    5136        -  2024-01-24

I thirst thought it was some week-format, but that does not make sense.

So I have found the logic.

The registered values “5136” are the number of days from the date 2010-01-01 to the periodic hot water date 2024-01-24.