| Calculate timestamp to date | 
               Given a timestamp (ellapsed time in
                  second since Unix time, that is to say 01/01/1970), create a new column with the
                  date | 
            
            
               | Calculate time since | 
               Calculates elapsed time since a date in the
                  desired unit (year, month, day, hour, minute, second) | 
            
            
               | Compare dates | 
               Compares this column to another column or a
                  constant | 
            
            
               | Convert dates | 
               Converts dates from one calendar to
                  another | 
            
            
               | Extract date parts | 
               Creates columns with year, month, quarter, day,
                  hour, minute, second, etc. | 
            
            
               | Modify dates | 
               Adds or substract time unit amount |