php: fuzzy time ago

gistfile1.php

 <?php
function prettyDate($date){
    $time = strtotime($date);
    $now = time();
    $ago = $now - $time;
    if($ago < 60){
        $when = round($ago);
        $s = ($when == 1)?"second":"seconds";
        return "$when $s ago";
    }elseif($ago < 3600){
        $when = round($ago / 60);
        $m = ($when == 1)?"minute":"minutes";
        return "$when $m ago";
    }elseif($ago >= 3600 && $ago < 86400){
        $when = round($ago / 60 / 60);
        $h = ($when == 1)?"hour":"hours";
        return "$when $h ago";
    }elseif($ago >= 86400 && $ago < 2629743.83){
        $when = round($ago / 60 / 60 / 24);
        $d = ($when == 1)?"day":"days";
        return "$when $d ago";
    }elseif($ago >= 2629743.83 && $ago < 31556926){
        $when = round($ago / 60 / 60 / 24 / 30.4375);
        $m = ($when == 1)?"month":"months";
        return "$when $m ago";
    }else{
        $when = round($ago / 60 / 60 / 24 / 365);
        $y = ($when == 1)?"year":"years";
        return "$when $y ago";
    }
}

echo prettyDate("2012-09-12 12:23:45")."<br />";
echo prettyDate("2012-09-13 05:25:45")."<br />";
echo prettyDate("2012-01-01 01:00:00")."<br />";
echo prettyDate("2001-05-30 00:00:00")."<br />"; 
?>

Won't this get more and more inaccurate as time passes, considering that months and years don't always have the same length?

Fuzzy. :P It uses an average. Should be fine for estimating, which is what it's all about.

I wrote a french version, can be used in twig extension :)

   public function date_fuzzy(\DateTime $date = null)
    {
        if($date==null) return "n/a";

        $time = $date->getTimestamp();
        $now = time();
        $ago = $now - $time;
        $unit = "";
        if ($ago < 60) {
            $value = round($ago);
            $unit = ($value == 1) ? "second" : "secondes";
        } elseif ($ago < 3600) {
            $value = round($ago / 60);
            $unit = ($value == 1) ? "minute" : "minutes";
        } elseif ($ago >= 3600 && $ago < 86400) {
            $value = round($ago / 60 / 60);
            $unit = ($value == 1) ? "heure" : "heures";
        } elseif ($ago >= 86400 && $ago < 2629743.83) {
            $value = round($ago / 60 / 60 / 24);
            $unit = ($value == 1) ? "jour" : "jours";
        } elseif ($ago >= 2629743.83 && $ago < 31556926) {
            $value = round($ago / 60 / 60 / 24 / 30.4375);
            $unit = ($value == 1) ? "mois" : "mois";
        } else {
            $value = round($ago / 60 / 60 / 24 / 365);
            $unit = ($value == 1) ? "an" : "ans";
        }
        return "Il y a $value $unit";
    }