fix typo and broken url

Dectinc Chen

2021-04-16 681351d74040d64024c924a6d7da4e17b96d6a38

 src/main/java/com/genersoft/iot/vmp/gb28181/bean/WvpSipDate.java

@@ -10,6 +10,11 @@
 */
public class WvpSipDate extends SIPDate {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    
    private Calendar javaCal;

    public WvpSipDate(long timeMillis) {