litzinger/date.js

## date.js
/*
 * JavaScript Pretty Date
 * Copyright (c) 2011 John Resig (ejohn.org)
 * Licensed under the MIT and GPL licenses.
 */

// Takes an ISO time and returns a string representing how
// long ago the date represents.
function prettyDate(time){
    var date = new Date((time || "").replace(/-/g,"/").replace(/[TZ]/g," ")),
        diff = (((new Date()).getTime() - date.getTime()) / 1000),
        day_diff = Math.floor(diff / 86400);

    if ( isNaN(day_diff) || day_diff < 0 || day_diff >= 31 )
        return;

    return day_diff == 0 && (
            diff < 60 && "just now" ||
            diff < 120 && "1 minute ago" ||
            diff < 3600 && Math.floor( diff / 60 ) + " minutes ago" ||
            diff < 7200 && "1 hour ago" ||
            diff < 86400 && Math.floor( diff / 3600 ) + " hours ago") ||
        day_diff == 1 && "Yesterday" ||
        day_diff < 7 && day_diff + " days ago" ||
        day_diff < 31 && Math.ceil( day_diff / 7 ) + " weeks ago";
}

// If jQuery is included in the page, adds a jQuery plugin to handle it as well
if ( typeof jQuery != "undefined" )
    jQuery.fn.prettyDate = function(){
        return this.each(function(){
            var date = prettyDate(this.title);
            if ( date )
                jQuery(this).text( date );
        });
    };

## index.html
<html>
<head>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script src="date.js"></script>

<script type="text/javascript">

$(function(){

    var base_url = 'http://domain.com/path-to-files/';

    $.getJSON(base_url+'xml-to-json/proxy.php?feed=https://feeds.foursquare.com/history/3MLPIJ0XXAUVJTJOWBGQD1TD3FTBP1M3.rss', function(data)
    {
        $('.tweet_wrapper').html('');

        if( ! data)
        {
            $('.tweet_wrapper').append('<p>No data found.</p>');
            return;
        }

        if(data.error)
        {
            $('.tweet_wrapper').append('<p>'+ data.error +'</p>');
            return;
        }

        $.each(data.rss.channel.item, function(key, val)
        {
            var item = '<p>'+ val.description +'<a href="'+ val.link +'" class="timeago" target="_blank">'+ prettyDate(val.pubDate) +'</a></p>';

            $('.tweet_wrapper').append(item);
        });
    });

});

</script>

</head>
<body>

<section class="recent-updates">
    <h4>Recent Checkins</h4>
    <div class="tweet">
        <div class="tweet_wrapper">
            <p>Loading...</p>
        </div>
    </div>
</section>

</body>
</html>

## proxy.php
<?php

set_include_path(
    PATH_SEPARATOR . 'Zend/'
    . PATH_SEPARATOR . get_include_path()
);

require 'Zend/Json.php';

// $_GET['feed'] = 'https://feeds.foursquare.com/history/4QXQCZRSPGNMYF0TT0JLXXJ4VOCO5SLO.rss';

if(isset($_GET['feed']) AND $_GET['feed'] != '')
{
    $ch = curl_init($_GET['feed']);

    header("Access-Control-Allow-Origin: *");

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        "Content-Type: application/xml; charset=UTF-8",
        "Access-Control-Allow-Origin: *"
    ));

    $xml = curl_exec($ch);

    // Because Firefox can't handle the date format returned from Foursquare
    $xml = preg_replace_callback('/<pubDate>(.+?)<\/pubDate>/', 'fix_date', $xml);

    curl_close($ch);

    echo Zend_Json::fromXml($xml, true);
}
else
{
    echo json_encode(array('error' => 'No feed defined.'));
}


function fix_date($matches)
{
    if(isset($matches[1]))
    {
        return '<pubDate>'. date('Y-m-d\TH:i:s\Z', strtotime($matches[1])) .'</pubDate>';
    }
    else
    {
        return $matches[1];
    }
}
	/*
	* JavaScript Pretty Date
	* Copyright (c) 2011 John Resig (ejohn.org)
	* Licensed under the MIT and GPL licenses.
	*/

	// Takes an ISO time and returns a string representing how
	// long ago the date represents.
	function prettyDate(time){
	var date = new Date((time \|\| "").replace(/-/g,"/").replace(/[TZ]/g," ")),
	diff = (((new Date()).getTime() - date.getTime()) / 1000),
	day_diff = Math.floor(diff / 86400);

	if ( isNaN(day_diff) \|\| day_diff < 0 \|\| day_diff >= 31 )
	return;

	return day_diff == 0 && (
	diff < 60 && "just now" \|\|
	diff < 120 && "1 minute ago" \|\|
	diff < 3600 && Math.floor( diff / 60 ) + " minutes ago" \|\|
	diff < 7200 && "1 hour ago" \|\|
	diff < 86400 && Math.floor( diff / 3600 ) + " hours ago") \|\|
	day_diff == 1 && "Yesterday" \|\|
	day_diff < 7 && day_diff + " days ago" \|\|
	day_diff < 31 && Math.ceil( day_diff / 7 ) + " weeks ago";
	}

	// If jQuery is included in the page, adds a jQuery plugin to handle it as well
	if ( typeof jQuery != "undefined" )
	jQuery.fn.prettyDate = function(){
	return this.each(function(){
	var date = prettyDate(this.title);
	if ( date )
	jQuery(this).text( date );
	});
	};
	<html>
	<head>

	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
	<script src="date.js"></script>

	<script type="text/javascript">

	$(function(){

	var base_url = 'http://domain.com/path-to-files/';

	$.getJSON(base_url+'xml-to-json/proxy.php?feed=https://feeds.foursquare.com/history/3MLPIJ0XXAUVJTJOWBGQD1TD3FTBP1M3.rss', function(data)
	{
	$('.tweet_wrapper').html('');

	if( ! data)
	{
	$('.tweet_wrapper').append('<p>No data found.</p>');
	return;
	}

	if(data.error)
	{
	$('.tweet_wrapper').append('<p>'+ data.error +'</p>');
	return;
	}

	$.each(data.rss.channel.item, function(key, val)
	{
	var item = '<p>'+ val.description +'<a href="'+ val.link +'" class="timeago" target="_blank">'+ prettyDate(val.pubDate) +'</a></p>';

	$('.tweet_wrapper').append(item);
	});
	});

	});

	</script>

	</head>
	<body>

	<section class="recent-updates">
	<h4>Recent Checkins</h4>
	<div class="tweet">
	<div class="tweet_wrapper">
	<p>Loading...</p>
	</div>
	</div>
	</section>

	</body>
	</html>
	<?php

	set_include_path(
	PATH_SEPARATOR . 'Zend/'
	. PATH_SEPARATOR . get_include_path()
	);

	require 'Zend/Json.php';

	// $_GET['feed'] = 'https://feeds.foursquare.com/history/4QXQCZRSPGNMYF0TT0JLXXJ4VOCO5SLO.rss';

	if(isset($_GET['feed']) AND $_GET['feed'] != '')
	{
	$ch = curl_init($_GET['feed']);

	header("Access-Control-Allow-Origin: *");

	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
	"Content-Type: application/xml; charset=UTF-8",
	"Access-Control-Allow-Origin: *"
	));

	$xml = curl_exec($ch);

	// Because Firefox can't handle the date format returned from Foursquare
	$xml = preg_replace_callback('/<pubDate>(.+?)<\/pubDate>/', 'fix_date', $xml);

	curl_close($ch);

	echo Zend_Json::fromXml($xml, true);
	}
	else
	{
	echo json_encode(array('error' => 'No feed defined.'));
	}


	function fix_date($matches)
	{
	if(isset($matches[1]))
	{
	return '<pubDate>'. date('Y-m-d\TH:i:s\Z', strtotime($matches[1])) .'</pubDate>';
	}
	else
	{
	return $matches[1];
	}
	}