api.php

<?php
  //funció per calcular temps passat des d'una data
  //format: "yyyy-mm-dd hh:MM:ss"
  function time_ago($time) {
    $time_ago = strtotime($time);
    $cur_time = time();
    $time_elapsed = $cur_time - $time_ago;

    $seconds    = $time_elapsed ;
    $minutes    = round($time_elapsed / 60 );
    $hours      = round($time_elapsed / 3600);
    $days       = round($time_elapsed / 86400 );
    $weeks      = round($time_elapsed / 604800);
    $months     = round($time_elapsed / 2600640 );
    $years      = round($time_elapsed / 31207680 );

    if($seconds<0){
      return "future";
    }else if($seconds <= 60){
      return "less than a minute ago";
    }else if($minutes <=60){
      if($minutes==1){ return "a minute ago"; }
      else{ return "$minutes minutes ago"; }
    }else if($hours <=24){
      if($hours==1){ return "an hour ago"; }
      else{ return "$hours hours ago"; }
    }else if($days <= 7){
      if($days==1){ return "yesterday"; }
      else{ return "$days days ago";}
    }else if($weeks <= 4.3){
      if($weeks==1){ return "a week ago"; }
      else{ return "$weeks weeks ago"; }
    }else if($months <=12){
      if($months==1){ return "a month ago"; }
      else{ return "$months months ago"; }
    }else{
      if($years==1){ return "one year ago"; }
      else{ return "$years years ago"; }
    }
  }

  $t  = filemtime("index.html"); //numero
  $ts = strftime("%Y-%m-%d %H:%M:%S",$t); //string
  $ta = time_ago($ts); //string
  echo "$ts ($ta)";
?>