// toMinutes - converts a time string in format 00:00 to a number of minutes.
static function toMinutes($value) {
$signMultiplier = ttStartsWith($value, '-') ? -1 : 1;
- if ($signMultiplier == -1) $duration = ltrim($duration, '-');
+ if ($signMultiplier == -1) $value = ltrim($value, '-');
$time_a = explode(':', $value);
return $signMultiplier * ((int)@$time_a[1] + ((int)@$time_a[0]) * 60);