Google App Script - Google Form - Insert Default Date and Time

Code.gs

function defaultDateAndTime() {
  // This gscript didn't work for a little bit.
  // I renamed the function. I was also messing with the triggers and which functions they were referencing.
  // I thought I got them all matched up, but it still didn't work right.
  // Tried one last time. Deleted all triggers. Renamed this function. Recreated Trigger. Works.
  
  var sheet = SpreadsheetApp.getActiveSheet();
  var lastRow = sheet.getLastRow();
  var dateColumn = 4; // Type this in manually if you know it.
  var timeColumn = 5; // This as well.
 
  /*
  If you for some other reason seek an alternative method to find the date and time columns, here:
  This will add at minimum 1 second of processing time to your script.
  
  var lastColumn = sheet.getLastColumn()
  var labelRow = sheet.getRange(1, 1, 1, lastColumn);
  for (var column = 1, row = 1; column <= lastColumn; column++) {
    var iterator = labelRow.getCell(row, column);
    if(iterator.getValue()=='Date'){dateColumn = iterator.getColumn()}
    if(iterator.getValue()=='Time'){timeColumn = iterator.getColumn()}
  }
  */
  
  var dateCell = sheet.getRange(lastRow, dateColumn);
  var timeCell = sheet.getRange(lastRow, timeColumn);
  
  if(dateCell.getValue() == "") { dateCell.setValue(new Date()); }
  if(timeCell.getValue() == "") { timeCell.setValue((new Date()).toLocaleTimeString().split(' ').splice(0,2).join(' ')); }
};