Validation of date format

 What is the best way to validate a date field?  - and hopefully give a guideline to the user.   What I have tried - set as text and display a placeholder  - user can still enter anything.  Set as Date - validate with 'validate[required,minSize[10]]'.  Cannot then present a placeholder and if user enters dec 3,1965  - it comes through as 2029-07-17.  What I would like is yyyy-mm-dd  but I have found that if the user enters dd-mm-yyyy - it will get correctly flipped to y-m-d which would be fine except for the other possible incorrect entries that get so badly interpreted.
 

Why don't you create a Date field instead of Text field ?

Tuan

I have tried setting it as date and, as mentioned above, when I "Set as Date - validate with 'validate[required,minSize[10]]'. Cannot then present a placeholder and if user enters dec 3,1965 - it comes through as 2029-07-17." I cannot see how one can validate a date field or ensure it comes through properly.
Here is the setting when I set it as Date - and which allows something like 'dec 3,1965' and  

I have found the built-in validates datFormat and dateBefore but haven't been able to figure out the exact inpout format. What I have now is dateFormat:'dob','Y-m-d'|dateBefore:'dob';date(). The dateFormat alone works but the error message is in the bottom right - not linked to the field. The user would likely not notice. The DateBefore didn't seem to be recognized and now I get you exceeded the number of form submissions limit . Hopefully I can continue later when the security time limit runs out. I would really appreciate if you could give me the proper syntax for this so I can get on with my development.