Converting a Json data object to a Java Calendar object.
public static Calendar JsonDateToDate(String jsonDate) {
// "/Date(1321867151710+0100)/"
int idx1 = jsonDate.indexOf("(");
int idx2 = jsonDate.indexOf(")") - 5;
String s = jsonDate.substring(idx1 + 1, idx2);
long timeInMilliSeconds = Long.valueOf(s);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(timeInMilliSeconds);
return calendar;
}