驗證日期格式DD-MMM-YYYY(11-JAN-2016)

public boolean isDate(String dateStr) {
		String[] date = dateStr.split("-");
		if (date.length == 3) {
			try {
				int year = Integer.parseInt(date[2]);
				String month = date[1].toString();
				int day = Integer.parseInt(date[0]);
				if(isYear(year) && isMonth(month) && isDay(day,month,year)) {
					return true;
				} else {
					return false;
				}
			} catch(Exception e) {
				return false;
			}				
		} else {
			return false;
		}
	}
	
	public boolean isMonth(String month) {
		if(month.equalsIgnoreCase("JAN")||month.equalsIgnoreCase("FEB")||month.equalsIgnoreCase("MAR")||month.equalsIgnoreCase("APR")
				||month.equalsIgnoreCase("MAY")||month.equalsIgnoreCase("JUN")||month.equalsIgnoreCase("JUL")||month.equalsIgnoreCase("AUG")
				||month.equalsIgnoreCase("SEP")||month.equalsIgnoreCase("OCT")||month.equalsIgnoreCase("NOV")||month.equalsIgnoreCase("DEC")) {
			return true;
		} else {
			return false;
		}		
	}
	
	public boolean isYear(int year) {
		if(1000 < year && year < 10000) {
			return true;
		} else {
			return false;
		}		
	}
	
	public boolean isDay(int day,String month,int year) {
		if (month.equalsIgnoreCase("JAN")|| month.equalsIgnoreCase("MAR") || month.equalsIgnoreCase("MAY") || month.equalsIgnoreCase("JUL") || month.equalsIgnoreCase("AUG") || month.equalsIgnoreCase("OCT") || month.equalsIgnoreCase("DEC")) {
			if (1 <= day && day <= 31) {
				return true;
			}
		} else if (month.equalsIgnoreCase("APR") || month.equalsIgnoreCase("JUN") || month.equalsIgnoreCase("SEP") || month.equalsIgnoreCase("NOV")) {
			if (1 <= day && day <= 30) {
				return true;
			}
		} else {
			if(isLeapYear(year)) {
				if(1 <= day && day <= 29) {
					return true;
				}
			} else {
				if(1 <= day && day <= 28) {
					return true;
				}
			}
		}
		return false;
	}
	
	public boolean isLeapYear(int year) {
		if(year % 4 == 0 && year % 100!=0) {
			return true;
		} else {
			return false;
		}
	}