I don't know what you are using for the delivery date. Generally, the delivery date scheduler's main use to select the delivery date and time of their choice.
With Magento 2 estimated delivery date, you can choose your delivery date for any month and with any time preference. If you can purchase anything in December but you want to this item delivery in January then the Delivery scheduler allowed to this. Here you can see that
Here you can also see that you have to choose also February and March date what you prefer.
with this, you get extra features like:
Same day delivery with custom charges & cut-off time
Custom Delivery Option for Magento Customer Groups
Choose Date & Time format
Select Label & Comments
Keep a track of Delivery Orders
Display Delivery Date & Time with additional charges