private static boolean isBusinessDay(Calendar c) {
		return !(isWeekend(c) || isHoliday(c));
	}
Returns the <b>business days</b> between the two dates.  Returns 0 if the same date is
passed for both parameters.  The order of the dates does not matter.

@param date1 the first date
@param date2 the second date
@return the number of days
Ghidra/Framework/Generic/src/main/java/ghidra/util/DateUtils.java