monthNamesShort
and monthNames.
$.datepicker.setDefaults( $.datepicker.regional[ "ru" ] );
$('#myDate').datepicker({
clickInput: true,
monthNamesShort: [ "Jan", "Feb", "Mar", "APR", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" ],
dateFormat:"DD, d M yy",
});
<div class="input-prepend">
<span class="add-on"><i class="icon-calendar"></i></span>
<input class="span5" id="myDate" type="text">
</div>
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