Google App script - Automatically add Today Date column to all sheets on sheet open. Also UI options for the same

Google App script - Automatically add Today Date column to all sheets on sheet open. Also UI options for the same

function onOpen() {
  var ui = SpreadsheetApp.getUi();
  checkAndAddTodayColumnForAllSheets();
  ui.createMenu('Actions')
  .addItem('Add Today Column - All sheets', 'checkAndAddTodayColumnForAllSheets')
  .addItem('Delete Today Column - All sheets', 'deleteTodayColumnForAllSheets')
  .addItem('Add Today Column', 'checkAndAddTodayColumnForActiveSheet')
  .addItem('Delete Today Column', 'deleteTodayColumnForActiveSheet')
  .addToUi();
}

function sameDay(d1, d2) {
  return d1.getFullYear() === d2.getFullYear() &&
    d1.getMonth() === d2.getMonth() &&
    d1.getDate() === d2.getDate();
}

function checkAndAddTodayColumnForAllSheets(){
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheets = ss.getSheets();
  for( i=0;i<sheets.length;i++){
    var sheet = sheets[i];
    checkAndAddTodayColumn(sheet);
  }
}

function checkAndAddTodayColumnForActiveSheet(sheet){
  var sheet = SpreadsheetApp.getActiveSheet();
  checkAndAddTodayColumn(sheet);
}

function checkAndAddTodayColumn(sheet){
  var values = sheet.getRange('a1').getValues();
  var sheetDate = new Date(values[0][0]);
  var today = new Date();
  var isSameDay = sameDay(today,sheetDate);
  if(!isSameDay){
    sheet.insertColumnBefore(1);
    sheet.getRange('a1').setValue(new Date());
    sheet.autoResizeColumn(1);
  }
}

function deleteTodayColumnForActiveSheet(){
  var sheet = SpreadsheetApp.getActiveSheet();
  deleteTodayColumn(sheet)
}

function deleteTodayColumnForAllSheets(){
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheets = ss.getSheets();
  for( i=0;i<sheets.length;i++){
    var sheet = sheets[i];
    deleteTodayColumn(sheet);
  }
}

function deleteTodayColumn(sheet){
  var values = sheet.getRange('a1').getValues();
  var sheetDate = new Date(values[0][0]);
  var today = new Date();
  var isSameDay = sameDay(today,sheetDate);
  if(isSameDay){
    sheet.deleteColumn(1);
  }
}