little jquery popup on homepage - only first time - use localstorage to save

gistfile1.txt

$(document).ready(function(e){
  // local storage var
  var ls = localStorage;
  var now = new Date();
  var old = ( ls.getItem( 'cachetime' ) ) ? new Date( JSON.parse ( ls.getItem( 'cachetime' ) ) ) : new Date( '2000' );
  var dis = now - old;
  var day = dis / (1000 * 60 * 60 * 24 )  ;
  // show popup when EITHER:
  //  1) popup never shown before (original first visit)
  //  2) or if more then TIME passed after shown
  if(  day > 20 ){
    if( $('body.home').length ) $.fancybox.open({
      src  : '#popupnewsletter',
      type : 'inline',
      animationEffect : 'zoom-in-out',
      width: "500",
      height: "320",
    });
    // popup shown
    ls.setItem( 'cachetime', JSON.stringify( new Date() ) ) ;
  }

  // POPUP WINDOW - TRIGGER NEWSLETTER @HOMEPAGE
  $( '[name="mc-embedded-subscribe-form"] [type="submit"]' ).on('click', function(e){
    ls.setItem( 'cachetime', JSON.stringify( new Date() ) ) ;
  })

});