Indicates whether the given datetime value
dateTime occurs during the previous number of months, as determined by the current date and time on the system. Note that this function will return false when passed a value that occurs within the current month.
datetimezonevalue to be evaluated.
months: The number of months.
Date.IsInPreviousNMonths(dateTime as any, months as number) as nullable logical
Determine if the month before the current system time is in the previous two months.
Date.IsInPreviousNMonths(Date.AddMonths(DateTime.FixedLocalNow(), -1), 2)