Java 中验证日期有效性

static int[] DAYS = { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };  
  
/** 
 * @param date yyyy-MM-dd HH:mm:ss 
 * @return 
 */  
public static boolean isValidDate(String date) {  
    try {  
        int year = Integer.parseInt(date.substring(0, 4));  
        if (year <= 0)  
            return false;  
        int month = Integer.parseInt(date.substring(5, 7));  
        if (month <= 0 || month > 12)  
            return false;  
        int day = Integer.parseInt(date.substring(8, 10));  
        if (day <= 0 || day > DAYS[month])  
            return false;  
        if (month == 2 && day == 29 && !isGregorianLeapYear(year)) {  
            return false;  
        }  
        int hour = Integer.parseInt(date.substring(11, 13));  
        if (hour < 0 || hour > 23)  
            return false;  
        int minute = Integer.parseInt(date.substring(14, 16));  
        if (minute < 0 || minute > 59)  
            return false;  
        int second = Integer.parseInt(date.substring(17, 19));  
        if (second < 0 || second > 59)  
            return false;  
  
    } catch (Exception e) {  
        e.printStackTrace();  
        return false;  
    }  
    return true;  
}  
public static final boolean isGregorianLeapYear(int year) {  
    return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);  
}  
public static void main(String[] args) {  
    System.out.println(isValidDate("2100-02-29 23:00:01"));  
}