OData JSON Date Object to Timestamp

ODataJSONDateObjectToTimestamp.java

// OData json date string "/Date(1545727221)" to Timestamp
Pattern pattern = Pattern.compile("(\\d+)");
String onboardingDate = "/Date(1545727221)";
Matcher matcher = pattern.matcher( onboardingDate );
if (matcher.find()) {
  String matched = matcher.group();
  Timestamp dateToValidate = new Timestamp(Long.parseLong(matched));
}