为什么这个date_diff不起作用？

I want to display a 'NEW' div when an image has a 'date created' value set in a database, that is no more than a week old.

$now = new DateTime();
$then = new DateTime($imageSet->created);
$diff = date_diff($now,$then);
if($diff->format('%d') >= 0 && $diff->format('%d') < 8 && $imageSet->created != null) { $new = 1; } else { $new = 0; }

But with an image that has a date created value of 2016-05-17, this is showing the div 'NEW', when it's obviously much more than a week old. Based on my condition above, I'm expecting any date created value of 2016-07-12 or later to trigger the 'NEW' div.

Any ideas why it's not?

%d is the days part of a "years, months, days" description. In the case of a 40 day total difference, say, it would be around 9 days, because it's a one month, nine days difference.

If you want the total day difference, use %a.

Use following code

$now = new DateTime();
if(empty($imageSet->created)) {
    $new = 0
} else {
    $then = new DateTime($imageSet->created);
    $diff = date_diff($now,$then);
    if($diff->format('%a') >= 0 && $diff->format('%a') < 8 ) { 
        $new = 1; 
    } else { 
        $new = 0; 
    }
}