javascript - Copy and add timestamp

Question

SOLVED

Simply I added

dest.getRange(dest.getLastRow(),1).setValue(new Date()).setNumberFormat("yyyy-MM-dd HH:mm");

I'm here again because I would like to add a timestamp in column A.

At the moment the copy starts in column F.

  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = spreadsheet.getSheetByName('ws1');
  var dest = spreadsheet.getSheetByName('ws2');
  var startRow = 4;
  var lastRow = sheet.getLastRow();
  var numRows = lastRow  - startRow + 1;
  var lastCol = sheet.getLastColumn();
  var dataSetValues = sheet.getRange(startRow, 1, numRows, lastCol).getValues();

  for (var i = 0; i < numRows; i++){
    let aVal = dataSetValues[i][0];    
    let bVal = dataSetValues[i][1];    
    let cVal = dataSetValues[i][2];
    let dVal = dataSetValues[i][3];
    let fVal = dataSetValues[i][5];  
    let gVal = dataSetValues[i][6];
    let hVal = dataSetValues[i][7];
    // + other columns

    let sum = +fVal + +gVal;
        
    if (sum > 115) {
      
      let row = dataSetValues[i];
      
      var rngDest = dest.getRange(dest.getLastRow() + 1, 6, 1, row.length);
      
      rngDest.setValues([row]);

    }
  }

I tried this code:

function onEdit() {

  var spreadsheet = SpreadsheetApp.getActiveSheet();
  
  if( spreadsheet.getName() == "ws2" ) {
    
    var i = spreadsheet.getActiveCell();
    
    if(i.getColumn() == 6) {
      
      var timestamp = i.offset(0, -5);
      
      if( timestamp.getValue() === '' )
        
        timestamp.setValue(new Date());      
     }   
   }
}

Problem:

The timestamp doesn't appear, it works if I type manually in column F. I'd like to avoid using OnEdit script, it's possible to do it directly while copying?

Thanks

Update

I added full main code. I need a timestamp in column A. I would like to avoid using onedit because ws2 is a sheet where I will add other data and therefore it will be editable.

Answer 1

I solved with

dest.getRange(dest.getLastRow(),1).setValue(new Date()).setNumberFormat("yyyy-MM-dd HH:mm");