java 判断日期格式是否符合“YYYY-MM-DD”

package com.hrms.ws;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test {

public static boolean isValidDate(String sDate) {
     String datePattern1 = "\\d{4}-\\d{2}-\\d{2}";
     String datePattern2 = "^((\\d{2}(([02468][048])|([13579][26]))"
             + "[\\-\\/\\s]?((((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|"
             + "(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?"
             + "((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-\\/\\s]?("
             + "(((0?[13578])|(1[02]))[\\-\\/\\s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-\\/\\s]?"
             + "((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-\\/\\s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))";
     if ((sDate != null)) {
         Pattern pattern = Pattern.compile(datePattern1);
         Matcher match = pattern.matcher(sDate);
         if (match.matches()) {
             pattern = Pattern.compile(datePattern2);
             match = pattern.matcher(sDate);
             return match.matches();
         }
         else {
             return false;
         }
     }
     return false;
}
public static void main(String[] args) {
String dataString = "1902-01-13";// "19010101"
boolean reString = isValidDate(dataString);
System.out.println(reString);
}

}