cssValidatorJQuery.js

$(document).ready(function () {
  function sol(today,limit){
    let incorrectStyle = 0;
    $("tr").each(function (key, val) {
      let $tds = $(this).find('td'),
          $rowStyle = $(this).css('background-color'),
          customerId = $tds.eq(0).text(),
          issueDate = new Date($tds.eq(1).text()),
          returnDate = $tds.eq(2).text?new Date($tds.eq(2).text()):new Date();

          const singleDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
          const borrowDays = Math.round(Math.abs((issueDate - returnDate) / singleDay));
          console.log($rowStyle);
          if(borrowDays > limit && !$rowStyle.includes('background-color')){
            incorrectStyle++;
          }else if (borrowDays <= limit && $rowStyle.includes('background-color')){
            incorrectStyle++;
          }
    });
  }
    
  console.log(sol(new Date(), 14));
});