timestamp

function onEdit(e) {
  const row = e.range.getRow();
  const col = e.range.getColumn();
  if ([1,2].includes(col) && row >= 6 && e.source.getActiveSheet().getName() == "Data") {
    const offsetValue = e.range.offset(0,(col == 2) ? -1 : 1 ).getValue()
    if (offsetValue === 0 && Number(e.value) === 0) {
      const currentDate = new Date();
      e.range.offset(0,(col == 2) ? 2 : 3 ).setValue(currentDate);
    }
  }
}