maxDate and minDate not working in Jquery Datetime picker

All other attributes like format ,autoclose etc are working . but maxDate/minDate is not working.. pls help me

$(function() {
        $( "#fdate" ).datetimepicker(
          {
             format: 'yyyy-mm-dd',
            pickTime: false,
            startView: 'month',
            minView: 'month',
            autoclose: true,   
            maxDate: '0'
          });
    });