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"));  }