앱스크립트 질문 입니다.

첫번쨰 !!!
function onEdit(e) {

    var sht = SpreadsheetApp.getActiveSheet();

    var shtName = sht.getName();

    var currentCell = sht.getActiveCell();

    if( currentCell.getColumn() == 2 ) {

      var nextCell = currentCell.offset(0, -1);

      var newDate = Utilities.formatDate(new Date(),"GMT+09:00", "MM/dd/yyyy HH:mm:ss");

      nextCell.setValue(newDate);

    }

  }
두번쨰!!!

function onEdit(e) {

    var sht = SpreadsheetApp.getActiveSheet();

    var shtName = sht.getName();

    var currentCell = sht.getActiveCell();

    if( currentCell.getColumn() == 2 ) {

      var nextCell = currentCell.offset(0, -1);

      var newDate = Utilities.formatDate(new Date(),"GMT+09:00", "MM/dd/yyyy HH:mm:ss");

      nextCell.setValue(newDate);

    }

  }