In a formula column, the MAX_DATE_ELEMENTS() function displays the most recent date among the dates of the selected columns.

Formula

MAX_DATE_ELEMENTS(Colonne1,Colonne2)

Example 

MAX_DATE_ELEMENTS(Date 1,Date 2,Date 3)

Configurator

Result

I applied the formula MAX_DATE_ELEMENTS on the three Date columns to obtain the most recent date among the three.