縦列毎に最終更新日を挿入する Google Apps Script(GAS) for GoogleSpreadSheet. 2,7,19はシートの構造依存の数値

insertLastUpdate.gs

function insertLastUpdated() {
  var sheet = SpreadsheetApp.getActiveSheet();
  var currentCol = sheet.getActiveCell().getColumn();
  if(currentCol > 2 && currentCol < 7){
    sheet.getRange(19, currentCol).setValue(Utilities.formatDate(new Date(), 'JST', 'MM/dd HH:mm'));
  }
}