Date Validation

Hi,

I am having trouble validating four date fields in an AcroForm. Each date field has a different validation pattern:
(1) DD/MM/YY (eg 03/12/14, but also incorrectly accepts 03DEC14)
(2) MM/YYYY (eg 12/2014, but also incorrectly accepts DEC2014)
(3) DMMMYYYY (eg 3DEC2014, but also incorrectly accepts 3/12/2014)
(4) MMMYYYY (eg DEC2014, but also incorrectly accepts 12/2014)

I need to have the validation consistent with all fields. The difficulty that I am having is if I block the DEC type pattern it will also block the 12/ input (and visa versa).

Is there a Javascript way to explicity set a validation pattern so that the strict pattern will be tested?

Thanks in advance,

Niall