convert old memoryio datestring to new

var fs = require('fs');
var moment = require('moment-timezone');
moment().tz("America/Phoenix").format();

fs.readdir( process.argv[2], function (err, files) { 
  if (err){
    console.log("error", err);
    return;
  }

  function convertDate(file){
    var something = moment.tz(file.substring(0, 12), "MMDDYYHHmmss", "America/Phoenix");
    var newName = something.format('YYYY-MM-DD_HH-mm-ss.SSS');
    return newName;
  }
  console.log(files);
  files.forEach(function(file){
    var newName = convertDate(file);
    
    fs.renameSync(process.argv[2] + '/' + file, process.argv[3] + '/' + newName + '.jpg', function (err) {
      console.log(err);
    });
  });
  
});