how to submit form Automatically, when it time is up?

Am trying to soft delete the post when the timeout, but unable to do that automatically..! Here's My Code:

@php
$date=str_replace('-', '/', $post->created_at);
$endDate=date('Y/m/d H:i:s',strtotime($date. ' + '.$post->post_days.' days'));
@endphp    
@if($endDate == 0)
<form action="">
<input type="text" name="postId" value="">
<button type="submit" >test</button>
</form>
@endif

via Chebli Mohamed