Dynamic Time-Based Tonemap  

When you set correct tonemap value Graphics Options Interface with sun high in the sky it is often messes up night illumination.
Or shiny morning sun blazes with unmatched intensity.
Upon that distant forest path, there's been sunlight in the autumn leaves...
Oh, where was I? Right, so script only changes r2_tonemap settings gradually (every hour) and disables it on level change to underground location.

Choose your tonemap eyes adaptation speed script (1 or 10). Lower value for less visible hourly tonemap setting changes transition.