a custom calendar and coding on Shopify store

ONLY apply if you have custom shopify development experience!!!!!!! Here is the background info: -We current have a custom built calendar on Shopify: [login to view URL] (you can see it where it says pick delivery date) -This calendar has an interface built into our theme that allows us to select holidays to display for no delivery, along with which days of the week we offer delivery, etc. -There is a feature that charges customers an extra fee of 14.99 for Saturday delivery and 10.99 for Monday delivery -There is logic built into the cart that does not allow a delivery date to be selected within two days of the current day. -Supposedly there is logic built in that says if it is after 2pm on Friday (Hawaii time), they cannot select Monday delivery -There is a custom code built that estimates two business days prior to the requested ship date, and then this estimated date for us to ship is displayed along with the requested delivery date on the order info page. -There is a custom code that relays the requested delivery date and our estimated delivery date in ShipStation. --What we need-- (do not bid on this project unless you understand all of the items listed above) -The calendar is not displaying the months correctly. The current month (November) is right, but the following month (December) does not show up at all and then it skips straight to May -The extra fees for Saturday and Monday delivery can be selected, but it is not actually added to the total in the shopping cart. I *think* but am not sure, that it may have something to do with the associated variant for the fee being deleted (if they even used a variant to accomplish this). The extra fee displays in the shopping cart but is not actually added to the total -When we put a date in the template interface to tell the calendar it is a holiday and to grey it out, it does not do so. -The cutoff time of 2pm Hawaii is not working (ie, people are still able to select Monday delivery on a Friday after 2pm Hawaii time) -The date that the shopping cart generates for two business days prior to the requested delivery date is currently labeled "my_delivery_date:" We'd like that changed to "My Ship Date" instead, but you need to make sure doing so does not break the integration with ShipStation. --One other item NOT related to the calendar that we need fixed:-- -When you hover over a variant image, the zoom in of it displays the wrong item. To see this go to the following link, click on the variant "red" and then hover over the image to zoom. It will show you the wrong variant image. [login to view URL]