Create a new main stack.

Drag a button to the stack's card and assign the following properties:

Add the following code to the new button to initiate a date picker, as displayed in the given screenshot:

on mouseUp
  mobilePickDate "date"
end mouseUp

The output will be as follows:

When the user selects the date (month, day, year) and taps Done, you will want to ensure that you have a way to capture the date. LiveCode puts the user's selection into the the result system variable. You can test this by adding one line of code to the mobilePickDate command:

on mouseUp
  mobilePickDate "date"
  answer the result
end mouseUp...