Apps with 'Date picker' feature
- sleek offers a clean and simple interface to create and manage todos according to the principals of todo.txt. You can add contexts to your todos or assign them to projects. Priorities can be set and due dates will trigger notifications just in time.
- Pickate is a service aimed at easing the process of group decision-making in many common situations.
Discontinued
See http://pickate.com/ The old service is discontinued, and now it is a commercial service for music events