Validate date using jquery masked input plugin

I am using jquery masked input plugin for masking of input fields. I am using `GWT` and using jquery mask input function using `JSNI`.

 For date field having mask like "`MM/dd/yyyy`", 

how can I restrict user not to enter `month >12 or day >31`... 

My implementation is as follows: 

     $wnd.$.mask.definitions['y'] = '[12]';

    $wnd.$.mask.definitions['m'] = '[01]';

    $wnd.$.mask.definitions['d'] = '[0-3]';

    

        if (pattern== 'MM/DD/YYYY') {

    $wnd.$(id).mask("m9/d9/y999", {

    placeholder : p

        });

Here in month field, there are `2 digits(MM)`, 

 - first digit can be restricted to 0 to 1

 - second digit not able to control

I tried with conditional regex, not working fine.

Anything with conditional regex is also fine.

Basically I want user to enter only valid dates.

Please suggest.

Thanks.

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