Google Sheet Auto time stamp - google-apps-script

Question

I'm trying to auto-populate a cells time ( cell B2 in sheet "leads")
But doesn't seem to run the script successfully. Gives me the error "TypeError: Cannot read property "source" from undefined. (line 6, file "Code"
function onEdit(event) {
var timezone = "GMT-2";
var timestamp_format = "MM-dd-yyyy"; // Timestamp Format.
var updateColName = "Time";
var sheet = event.source.getSheetByName('Leads'); //Name of the sheet where you want to run this script.
var responseArray = ["Time"];
var questionArray = ["Time"];
var actRng = event.source.getActiveRange();
var editColumn = actRng.getColumn();
var index = actRng.getRow();
var headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues(); //get values and place them inside array
var dateCol = headers[0].indexOf(timeStampColName); //get index position inside the array
for (var i = 0; i < questionArray.length; i++) {
if (headers[0].indexOf(responseArray[1]) > -1 && index > 1 && editColumn == (headers[0].indexOf(questionArray[i]) + 1)) { // only timestamp if 'Last Updated' header exists, but not in the header row itself!
var cell = sheet.getRange(index, (headers[0].indexOf(responseArray[i]) + 1));
var date = Utilities.formatDate(new Date(), timezone, timestamp_format);
cell.setValue(date);
}
}
}
I've tried all solutions but nothing seems to give me a successful run.
I want cell B2 to automatically add the time when someone starts to enter data into cell A1

Answer 1

That code is very over complicated for what you're trying to achieve to be honest.
Try using this:
function onEdit(e) {
var TIME_ZONE = "GMT-2"; //enter desired timezone
var date = Utilities.formatDate(new Date(), TIME_ZONE, 'MM-dd-yyyy'); //enter desired date format
//if column A has been edited, set date in same row in column B
if (e.range.getColumn() == 1) {
var row = e.range.getRow();
e.source.getSheetByName('Leads').getRange(row, 2).setValue(date);
}
}
Put simply, this code will check that the user has edited column A, if so then it'll put a date value into the same row in column B.