Determines whether the specified month in the specified year and era is a leap month.
year An integer from 1 through 9378 that represents the year. month An integer that represents the month and ranges from 1 through 12 if year is not 9378, or 1 through 10 if year is 9378.era An integer from 0 through 1 that represents the era.
Always returns false because the System.Globalization.PersianCalendar class does not support the notion of a leap month.