delivery_date_time

Yes, it's CS-Cart (≧4.4.1, or earlier versions 4.3.9+) add-on for delivery date

Features:

• Import/export
• Date/time/time period settable by admin/customer
• Available through CS-Cart API
• Uses cool datepicker that can help you set any rules that you want (with some coding in /design/themes/responsive/templates/addons/loogaru_delivery_date/hooks/checkout/shipping_method.post.tpl)
• Variables in documents/emails added
• Sort and search by date as far as I remember =)

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No, seriously, nobody's donates =)