Question

I am trying to write a validation rule in Yii but can’t get the date compare to work. Looking to render the error message if End is not greater than 30 days past Start.

public function checkDate($attribute,$params)
    {
        $duration = strtotime(date('Y-m-d', strtotime($this->Start)) . ' +30 days');
        if ($this->End < $duration) 
                $this->addError('End','30 days or more!');
    }

With this every input yields the error message. I am using a MySql db and Start and End are date format

EDIT:
Given the input in the answers below I have tried

This will not even render the page now.

    $startDate = $this->Start;
    $endDate = $this->End;
    $interval = $startDate->diff($endDate);
    if ($interval < 30) 
                $this->addError('End','30 days or more!');

and

This gives the error 100% of the time.

$duration = date('Y-m-d', strtotime($this->Start . '+ 30 days'));
if ($this->End < $duration) 
    $this->addError('End','30 days or more!');

Answer 1

if you are compairing $duration to $this->END(which comes right out of the database) you need to put date('Y-m-d', $duration) before you check against $this->END
you’re compairing a strtotime to a date('Y-m-d') where are apples and oranges

change
$duration = strtotime(date(‘Y-m-d’, strtotime($this->Start)) . ‘ +30 days’);
to
$duration = date(‘Y-m-d’, strtotime($this->START . ‘+ 30 days’));

and your script should work

hope this helps