GDim

Сделал проще. На странице domain.com/register/ref/5020 редирект на https://

...
<?php
	// if http:// redirecting to https://
	if(!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] == ""){
		$redirect = "https://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
        	header("HTTP/1.1 301 Moved Permanently");
		header("Location: $redirect");
	}
?>
$(document).ready(function(){
      localStorage.setItem('referal',<?=$ref_id?>);
      window.location='/register';
    });

Т.е. проще везде использовать https и localstorage будет доступен

Решил с помощью php функции

public function calculateBetweenForPagination($page = 1, $startDate, $endDate)
    {
        $count = 15; // Количество записей на странице
        $shift = $count * ($page - 1);

        $from = clone($startDate->modify('+'.$shift.' day'));
        $to = clone($startDate->modify('+'.$count - 1 .' day'));

        if ($endDate < $to)
        {
            $to = $endDate;
        }
        $between['from'] = $from;
        $between['to'] = $to;

        return $between;
    }