This is a function that returns a string stating the amount of time has passed from one timestamp to another.

daysago.php

<?php
	function daysago($now,$then){
		$daycount = floor(($now-$then)/86400); //86400 seconds in a day
		$hourcount = floor(($now-$then)/3600); //3600 seconds in an hour
		$minutecount = floor(($now-$then)/60); //60 seconds in a minute
		if($daycount == 0) {
			$str = 'Created ';
			if($hourcount != 0) {
				$str .= $hourcount.' ';
				if($hourcount == 1) {
					$str .= 'hour';
				}else{
					$str .= 'hours';
				}
				$str .= ' and ';
			}
			$str .= $minutecount.' ';
			if($minutecount == 1) {
				$str .= 'minute';
			}else{
				$str .= 'minutes';
			}
			$str .= ' ago.';
			
			return $str;
		}
		if($daycount == 1) {
			return 'Created '.$daycount.' day ago.';
		}
		return 'Created '.$daycount.' days ago.';
	}
?>