基于另一个单元格的自动时间戳记

Question

我在这里找到了一个脚本，当在另一个单元格中键入内容时，该脚本会自动在一个单元格中填充时间戳。它的工作原理，但时间永远准确。它使同一时间整天。

谁能告诉我我在脚本中做错了什么吗？

我的文档https://docs.google.com/spreadsheets/d/1NRNs6QUQ0K1m9mPH00zGUDiVxL8A1foTXxXIQ_XFjpA/edit?usp=sharing包含以下脚本：

function onEdit(event)
{ 
  var timezone = "GMT-8";
  var timestamp_format = "MM-dd-yyy"; // Timestamp Format. 
  var updateColName = "Student Number";
  var timeStampColName = "Timestamp";
  var sheet = event.source.getSheetByName('SCAN LATE'); //Name of the sheet where you want to run this script.    
  var actRng = event.source.getActiveRange();
  var editColumn = actRng.getColumn();
  var index = actRng.getRowIndex();
  var headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues();
  var dateCol = headers[0].indexOf(timeStampColName);
  var updateCol = headers[0].indexOf(updateColName); updateCol = updateCol+1;
  //if (dateCol > -1 && index > 1 && editColumn == updateCol) { // only timestamp if 'Last Updated' header exists, but not in the header row itself!
    var cell = sheet.getRange(index, dateCol + 1);
    var date = Utilities.formatDate(new Date(), timezone, timestamp_format)
    var d = new Date();
    var curTime = d.toLocaleTimeString()
    cell.setValue(date.toString() + " " + curTime );
  //}
}