php - Sort by date using Isotope, breaking down into day/months/years -

i using isotope arrange , sort bunch of elements. have buttons controlling sorting.

i can't 'date' sorting work properly. have date being printed inside each element sorted , applied class of .date it. prints dd/mm/yy

<span class="date"><?php the_date('d/m/y');?></span> 

in simplest form can sort using -

getsortdata: {   date: '.date', } 

this organise number order fine days goes wrong when comes months. how can sort sort true date rather number.

i have tried using examples i've found on stackoverflow each 1 breaks isotope , elements not layout. below example of sort have work, maybe can use see need do?

distance: function( itemelem ) { var distance= $( itemelem ).find('.wppl-address').text(); return parsefloat( distance.replace( /[\(\)]/g, '') );   }, 

have php output :

 <span class="date"     data-date="<?php the_date('c');?>" >  <?php the_date('d/m/y');?>  </span> 

then use :

 getsortdata: {       date: function($item) {             return $item.data('date');         }  } 

or try out:

 getsortdata: {       date: function($item) {             return new date($item.data('date'));         }  }