[рони]

porezon,

<script>
     jQuery(function(){
 jQuery('#date_timepicker_start').datetimepicker({
  mask:true,
  step:30,
  lang:'ru',
  datepicker:false,
  format:'H:i',
  onShow:function( ct ){
   this.setOptions({
    maxTime:jQuery('#date_timepicker_end').val()?jQuery('#date_timepicker_end').val():false
   })
  }
 });
 jQuery('#date_timepicker_end').datetimepicker({
  mask:true,
  step:30,
  lang:'ru',
  datepicker:false,
  format:'H:i',
  onShow:function( ct ){
   this.setOptions({
    minTime:jQuery('#date_timepicker_start').val()?jQuery('#date_timepicker_start').val():false
   })
  }
 });
});
  </script>
  <p>Start <input type="text" value="" id="date_timepicker_start">  End <input type="text" value="" id="date_timepicker_end"></p>