Custom field - Split the duration per year, no min max formula?

Hi,

I am relatively new to MS Project and I want to split the duration of all tasks per year. My projects runs for three years and I*d like to have a custum column with the duration for each year 2016, 2018, 2019. While this is easy in excel with a Min, Max function I can*t find a way in MS Project. So far I can only get the whole duration with 

ProjDateDiff([Start],[Finish],"standard")/480

And This is an unsuccessful attempt for 2016

ProjDateDiff([Start],"12/31/2016","standard")/480

Is there really no math function max and min? I need to get the max of Start and beginning of  2016 and the min of End and end of 2016. 

Thanks a lot in advance!