I would like to retrieve data selected using  the calender.

I still can't get the stored data.

I appreciate if anyone could help with this issue. 

There was no error either with Visual force, Classes( 2 Classes)

(Visual Force is as follows)

Other parts except the following are abbreviated.

-----------------abbreviation------------------

<apex:inputfield value="{!task.POP_UPReceiptDateTime__c}">                        
   <apex:actionSupport event="onchange" action="{!intervalCounter}" rerender="renderPanel" />
</apex:inputfield>

----------------abbreviation------------------

(1st one of  the Classes is as below)

public with sharing class AAA {

        public List<ABC_T_PopUpReceipt__c> popupreceipt { get; set; }
        public ABC_T_PopUpReceipt__c createtime { get; set; }
        public datetime mstDatetime { get; set; }
        Integer count = 0;
     /////Default Constructor   
      public AAA() {
   mstDatetime = Datetime.now();
          createtime = new ABC_T_PopUpReceipt__c();
      }
      public void init(){
         initObjects();           
      }        
      public void initObjects(){  
           popupreceipt = new List<ABC_T_PopUpReceipt__c>();
           setobject();
      }       
      public void setObject(){       
        popupreceipt = AAADBAccess.getDatafromDBAccess();
      }             
      public ABC_T_PopUpReceipt__c getTask() {
  return createtime;
      }
      public void setTask(ABC_T_PopUpReceipt__c a) {
          
             mstDatetime = a.POP_UPReceiptDateTime__c;
      }
      public void reload() {
  init(); 
      }
      public PageReference intervalCounter() {
      count++;
      reload();
      return null;
      }
      public Integer getCount() {
     return count;
      }
}

(2nd one of the Classes is as below)

*This is to be called by the first one

public with sharing class AAADBAccess {
    public static List<ABC_T_PopUpReceipt__c__c> getDatafromDBAccess()
    {     
        Datetime kakuninbi = Datetime.now();
        List<ABC_T_PopUpReceipt__c__c> jyuryoukakunin = new List<ABC_T_PopUpReceipt__c__c>();
        jyuryoukakunin = [select Id, OwnerId, IsDeleted, Name, CreatedDate, CreatedById, LastModifiedDate, LastModifiedById, SystemModstamp,
                          POP_UPReceiptDateTime__c,kisyou_id__c,kisyou_id__r.Title__c,user_id__c                       
                    from ABC_T_PopUpReceipt__c__c
                    where POP_UPReceiptDateTime__c = : kakuninbi
                    order by POP_UPReceiptDateTime__c desc];        
      if (kisyoukeihou.size()==1)
         return jyuryoukakunin;
      else
         return null;
    }
}