WordPress Improved Human Time Difference

function bm_human_time_diff_enhanced( $duration = 60 ) {

	$post_time = get_the_time('U');
	$human_time = '';

	$time_now = date('U');

	// use human time if less that $duration days ago (60 days by default)
	// 60 seconds * 60 minutes * 24 hours * $duration days
	if ( $post_time > $time_now - ( 60 * 60 * 24 * $duration ) ) {
		$human_time = sprintf( __( '%s ago', 'binarymoon'), human_time_diff( $post_time, current_time( 'timestamp' ) ) );
	} else {
		$human_time = get_the_date();
	}

	return $human_time;

}

//usage
echo bm_human_time_diff_enhanced();