limit the view mode to months datepicker code example
Example: month and year picker bootstrap
<div class="input-append date" id="datepicker" data-date="02-2012"
data-date-format="mm-yyyy">
<input type="text" readonly="readonly" name="date" >
<span class="add-on"><i class="icon-th"></i></span>
</div>
$("#datepicker").datepicker({
viewMode: 'years',
format: 'mm-yyyy'
});