Check date in Laravel 5.8

I am beginner in Laravel. I use in my project Laravel 5.8.

I have this code:

$dateFrom = '2019-10-14';
$dateTo = '2019-11-18';

1. check if $ dateFrom and $ dateTo have the correct date format
2. we will check if $ dateFrom is less than $ dateTo 3.we check whether the number of days between $ dateFrom and $ dateTo is less than or equal to 60

How can I make this?

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