master calendar?

[#1]

can any body explain about these script

1.                 YeartoDate(TempDate)*-1 as CurYTDFlag, 
2.                YeartoDate(TempDate,-1)*-1 as LastYTDFlag, 
3.                inyear(TempDate, Monthstart($(varMaxDate)),-1) as RC12, 
4.                date(monthstart(TempDate), 'MMM-YYYY') as MonthYear, 
5.                ApplyMap('QuartersMap', month(TempDate), Null()) as Quarter, 
6.                Week(weekstart(TempDate)) & '-' & WeekYear(TempDate) as WeekYear, 
7.                WeekDay(TempDate) as WeekDay

How it will work 

explain above script

[maxgro · Accepted solution]

answers in image or attachment