code: public Apptentive.DateTime getTimeAtInstallTotal() {
  		// Simply return the first item's timestamp, if there is one.
  		if (versionHistoryItems.size() > 0) {
  			return new Apptentive.DateTime(versionHistoryItems.get(0).getTimestamp());
  		}
  		return new Apptentive.DateTime(Util.currentTimeSeconds());
  	}
docs: Returns the timestamp at the first install of this app that Apptentive was aware of.