Customers ask sometimes for clever tools when handling dates. We've listed a few examples here, feel free to add your suggestions below too
  1. Restricted a date field to either todays date or dates in the past (i.e. not dates in the future) - this would be handy when asking for "The date you moved in" / "Employment Start Date"
  2. restrict a date of birth when choosing a date -(to restricted to DOB as a minimum of 18 years old)
  3. Automatically calculate an age based on their date of birth
  4. Automatically calculate the time at an address based on a date field