difference between two date in carbon code example

Example 1: different days in carbon laravel between different dates

$created = new Carbon($survey->created_at);
$now = Carbon::now();
$difference = ($created->diff($now)->days < 1)
    ? 'today'
    : $created->diffForHumans($now);

Example 2: carbon compare same date

$date1->toDateString() == $date2->toDateString()