i_novichok

function onEdit(e) {
  var str = e.range.getRow();
  var stolb = e.range.getColumn();
  var sheet = e.source.getActiveSheet();
  
  if(!['РФ.100₽', 'Лист2', 'Лист3'].includes(sheet.getName())){ return; }
  if(stolb != 2){ return; }

  sheet.getRange(str, 3).setValue(new Date());
}