February 12, 2011 
Definition:
function human_time_diff( $from, $to = '' ) {}
Determines the difference between two timestamps.
The difference is returned in a human readable format such as "1 hour", "5 mins", "2 days".
Parameters
- int $from: Unix timestamp from which the difference begins.
- int $to: Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
Return values
returns:Human readable time difference.
Source code
function human_time_diff( $from, $to = '' ) {
if ( empty($to) )
$to = time();
$diff = (int) abs($to - $from);
if ($diff <= 3600) {
$mins = round($diff / 60);
if ($mins <= 1) {
$mins = 1;
}
/* translators: min=minute */
$since = sprintf(_n('%s min', '%s mins', $mins), $mins);
} else if (($diff <= 86400) && ($diff > 3600)) {
$hours = round($diff / 3600);
if ($hours <= 1) {
$hours = 1;
}
$since = sprintf(_n('%s hour', '%s hours', $hours), $hours);
} elseif ($diff >= 86400) {
$days = round($diff / 86400);
if ($days <= 1) {
$days = 1;
}
$since = sprintf(_n('%s day', '%s days', $days), $days);
}
return $since;
}
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