code: public static Date getExpirationDate(Bundle bundle) {
          Validate.notNull(bundle, "bundle");
          return getDate(bundle, EXPIRATION_DATE_KEY);
      }
docs: Gets the cached expiration date from a Bundle.
  
  @param bundle
  A Bundle in which the expiration date was stored.
  @return the cached expiration date, or null.
  
  @throws NullPointerException if the passed in Bundle is null