function eventAllDayDetermine() {
  if (  
    ($("#edit-end-hour").val() == "23") &&
    ($("#edit-end-minute").val() == "59") &&
    ($("#edit-start-hour").val() == "0") &&
    ($("#edit-start-minute").val() == "0")) {
      EventAllDayYes();
      $("#edit-start-minute-all-day").attr("checked","true");
  }
}




<div class="form-radios"><div class="form-item">
 <label class="option"><input type="radio" name="end_ampm" value="am"  checked="checked"  class="form-radio" /> am</label>
</div>
<div class="form-item">
 <label class="option"><input type="radio" name="end_ampm" value="pm"   class="form-radio" /> pm</label>
</div>