my own relative time converter

gistfile1.aw

<?php
class Time {

	/**
	 * Seconds
	 */
	const SECOND  = 1;

	/**
	 * Minutes
	 */
	const MINUTE  = 60;

	/**
	 * Hours
	 */
	const HOUR    = 3600;

	/**
	 * Days
	 */
	const DAY     = 86400;

	/**
	 * Weeks
	 */
	const WEEK    = 604800;

	/**
	 * Months
	 */
	const MONTH   = 2592000;

	/**
	 * Tears
	 */
	const YEAR    = 31536000;

	/**
	 * Decades
	 */
	const DECADE  = 315360000;

	/**
 	 * Centuries
 	 */
	const CENTURY = 3153600000;

    /**
     * Convert UNIX timestamp to human readable format
     * 
     * @param number $timestamp UNIX timestamp
     * @return string Return human readable format of $timestamp
     * @access public
     * @author moimikey
     * @static
     */
	public static function relative_time( $timestamp ) {
		$diff = time() - $timestamp;
		
		if( $diff >= self::CENTURY ) {
			$delta = intval( $diff / self::CENTURY );
			return ( $delta > 1 ) ? "{$delta} centuries ago" : "{$delta} century ago";
		} elseif( $diff >= self::DECADE ) {
			$delta = intval( $diff / self::DECADE );
			return ( $delta > 1 ) ? "{$delta} decades ago" : "{$delta} decade ago";
		} elseif( $diff >= self::YEAR ) {
			$delta = intval( $diff / self::YEAR );
			return ( $delta > 1 ) ? "{$delta} years ago" : "{$delta} year ago";
		} elseif( $diff >= self::MONTH ) {
			$delta = intval( $diff / self::MONTH );
			return ( $delta > 1 ) ? "{$delta} months ago" : "{$delta} month ago";
		} elseif( $diff >= self::WEEK ) {
			$delta = intval( $diff / self::WEEK );
			return ( $delta > 1 ) ? "{$delta} weeks ago" : "{$delta} week ago";
		} elseif( $diff >= self::DAY ) {
			$delta = intval( $diff / self::DAY );
			return ( $delta > 1 ) ? "{$delta} days ago" : "{$delta} day ago";
		} elseif( $diff >= self::HOUR ) {
			$delta = intval( $diff / self::HOUR );
			return ( $delta > 1 ) ? "{$delta} hours ago" : "{$delta} hour ago";
		} elseif( $diff >= self::MINUTE ) {
			$delta = intval( $diff / self::MINUTE );
			return ( $delta > 1 ) ? "{$delta} minutes ago" : "{$delta} minute ago";
		} else {
			return 'moments ago';
		}
	}
}
?>