Insert current date in Google Spreadsheets

// Insert current date in Google Spreadsheet
function onOpen() {
  var ui = SpreadsheetApp.getUi();
  // Or FormApp or SpreadsheetApp.
  ui.createMenu('Date')
      .addItem('Insert Date', 'insertDate')
      .addToUi();
}

function insertDate() {
  var cell = SpreadsheetApp.getActive().getActiveCell();
  if (cell) {
    var element = cell.setValue(Utilities.formatDate(new Date(), 'GMT', 'dd/MM/yyyy'));
    // For formatting codes see: http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
    } else {
      SpreadsheetApp.getUi().alert('Cannot get active cell.');
  }
}