Custom field format with date/calendar

Dear all,
it is not possible to create a custom field, additional to the field “due date”, with date-/calendar format. I need this field for our sales funnel as “date of last activity”. So it shouldn’t become red when uverdue, but needs to be sortable. All current custom fields only offer figures, text or dropdown.

2 posts were merged into an existing topic: DATE - Custom Field Type