如何从“JAN-2014”格式的日期获得月数？

Actually, i am using jquery datepicker and getting month in "MONTH-YEAR" format? how i can get month number form this format in PHP or JAVASCRIPT?

js code:

  $("#date1_live").datepicker({
            changeMonth: true,
            changeYear: true,
                        showAnim:'slideDown',
                        dateFormat:'M yy'
        });      

html text field:

<input type="text" name="reportMonth" id="date1_live" required Placeholder="Select Start Date" >

using php try like this

$month = 'JAN-2014';
echo date('m', strtotime($month));

Please take a look at the following documentation.

jQuery UI Datepicker

The format for parsed and displayed dates. For a full list of the possible formats see the formatDate function. Code examples: Initialize the datepicker with the dateFormat option specified:

$( ".selector" ).datepicker({ dateFormat: "yy-mm-dd" });

try this,

 alert($("#datepicker").datepicker({ dateFormat: "mm-yy" }).val());

or Demo

         {
            changeMonth: true,
            changeYear: true,
            showAnim:'slideDown',
            dateFormat:"mm-yy"
       }