/**
* TimeSpan::Subtract()
*
* @param mixed $timeSpan
* @return
*/
function Subtract($timeSpan)
{
if (!is_object($timeSpan)) {
$timeSpan = new TimeSpan($timeSpan);
}
$newTimeSpan = new TimeSpan();
$carry = 0;
$newTimeSpan->p_fractions = $this->p_fractions - $timeSpan->p_fractions;
if ($newTimeSpan->p_fractions < 0) {
$newTimeSpan->p_fractions += 1000;
$carry = 1;
}
$newTimeSpan->p_seconds = $this->p_seconds - $timeSpan->p_seconds - $carry;
if ($newTimeSpan->p_seconds < 0) {
$newTimeSpan->p_seconds += 60;
$carry = 1;
} else {
$carry = 0;
}
$newTimeSpan->p_minutes = $this->p_minutes - $timeSpan->p_minutes - $carry;
if ($newTimeSpan->p_minutes < 0) {
$newTimeSpan->p_minutes += 60;
$carry = 1;
} else {
$carry = 0;
}
$newTimeSpan->p_hours = $this->p_hours - $timeSpan->p_hours - $carry;
if ($newTimeSpan->p_hours < 0) {
$newTimeSpan->p_hours += 24;
$carry = 1;
} else {
$carry = 0;
}
$newTimeSpan->p_days = $this->p_days - $timeSpan->p_days - $carry;
$newTimeSpan->ComputeTotals();
return $newTimeSpan;
}
