Days in Month - HANA?

I have [ReportingMonth] = [1,2,3,4,5,6,7,8,9,10,11,12] as a field which is type Number and I also have [ReportingYear] = [2013,2014,2015,2016] type Number

I want to calculate # of days in Month. I want for current year & month to calculate # of days as of today but for all prior months of previous years to be calculated as full months.

I am using below formula in WEBI and getting # of days accurately. How would I do something similar in HANA as a calculated column?

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=If (FormatNumber([ReportingMonth];"00")=FormatNumber(MonthNumberOfYear(CurrentDate());"00"))

And

(FormatNumber([ReportingYear];"0000")=FormatNumber(Year(CurrentDate());"0000"))

Then DayNumberOfMonth(CurrentDate())

Else DayNumberOfMonth(LastDayOfMonth(ToDate([MMYYYY];"MMyyyy")))

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