MinutesField.php

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<?php

class MinutesField extends AbstractField
{
    public function isSatisfiedBy(DateTime $date, $value)
    {
        return $this->isSatisfied($date->format('i'), $value);
    }

    public function increment(DateTime $date, $invert = false)
    {
        if ($invert) {
            $date->sub(new DateInterval('PT1M'));
        } else {
            $date->add(new DateInterval('PT1M'));
        }

        return $this;
    }

    public function validate($value)
    {
        return (bool) preg_match('/[\*,\/\-0-9]+/', $value);
    }
}