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<?php $deliveryDateFrom = new DateTime('2015-09-20'); $actualDate = new DateTime('2015-09-10'); var_dump($actualDate >= $deliveryDateFrom->sub(new DateInterval($this->interval))); $deliveryDateFrom = new DateTime('2015-09-20'); $actualDate = new DateTime('2015-09-01'); var_dump($actualDate >= $deliveryDateFrom->sub(new DateInterval($this->interval))); $deliveryDateFrom = new DateTime('2015-09-20'); $actualDate = new DateTime('2015-09-20'); var_dump($actualDate >= $deliveryDateFrom->sub(new DateInterval($this->interval))); $deliveryDateFrom = new DateTime('2015-09-20'); $actualDate = new DateTime('2015-09-30'); var_dump($actualDate >= $deliveryDateFrom->sub(new DateInterval($this->interval)));

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