public bool IsLeapMonth(int year, int month, int era)
{
year = GetGregorianYear(year, era);
if (month < 1 || month > 12) {
throw new ArgumentOutOfRangeException(
"month",
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("ArgumentOutOfRange_Range"),
1,
12));
}
return (false);
}