getShippingData.php

<?php

// https://magento.stackexchange.com/questions/159346/magento-2-add-custom-extesion-html-file-in-shipping-method-block
// http://oyenetwork.com/articles/magento2-devliery-date-module-creation-from-scratch/
public function getShippingData($quoteId)
    {
        return [
            [
                'calendar_type' => 'ONLINE',
                'date'          => '22/03/2016',
                'delivery_slot' => '11AM-3PM,3PM-7PM,7PM-9PM',
                'guid'          => 'ITEM',
                'item_no'       => 'IP035098',
                'sequence_no'   => '0',
                'zone'          => 'ALL',
            ],
            [
                'calendar_type' => 'ONLINE',
                'date'          => '23/03/2016',
                'delivery_slot' => '11AM-3PM,3PM-7PM,7PM-9PM',
                'guid'          => 'ITEM',
                'item_no'       => 'IP035098',
                'sequence_no'   => '0',
                'zone'          => 'ALL',
            ],
        ];
    }