With debugging enabled, you should have gotten the following message:
Notice: A non well formed numeric value encountered
This is because strtotime()
expects an integer as its second argument. You could use it like so
$date = date('Y-m-d', strtotime('+1 week', strtotime($lejar_datum)));
or if you want to use the more modern approach with DateTime
$dt = DateTime::createFromFormat('Y-m-d', $lejar_datum)->modify('+1 week');
update_post_meta($job_id, '_job_expires', $dt->format('Y-m-d'));
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