code: public void setEventCreatedOn(String eventCreatedOn) {
          Long milliseconds = TimeUnit.SECONDS.toMillis(Long.parseLong(eventCreatedOn));
          this.eventCreatedOn = new Date(milliseconds);
      }
docs: Gerrit server-based time stamp when the event was created by Gerrit Server.
  ONLY USE FOR UNIT TESTS!
  @param eventCreatedOn the eventCreatedOn to set