Converts dates into a relative time e.g. 2 months
Any valid date that can be passed to strtotime()
- http://www.php.net/manual/en/datetime.formats.date.php
A value from the PHP time()
function e.g. 1333494410
relative_time('2012-04-04 12:58:43');
relative_time('2012-04-04');
relative_time('12/22/78');
relative_time(1333494410);
Adapted from - http://stackoverflow.com/a/2916189/617615