DOCUMENT:Q238077  12-JUN-2002  [visualc]
TITLE   :HOWTO: Set Blank Date as Initial Value for Date Time Control
PRODUCT :Microsoft C Compiler
PROD/VER::5.0,6.0
OPER/SYS:
KEYWORDS:kbCmnCtrls kbCtrl kbDateTime kbMFC kbVC kbDSupport kbGrpDSMFCATL

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The information in this article applies to:

 - Microsoft Visual C++, 32-bit Enterprise Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Professional Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
 - Microsoft Visual C++.NET (2002) 
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SUMMARY
=======

Both Windows Date Time Picker control (CDateTimeCtrl) and Microsoft Date Time
Picker ActiveX controls have the current date as the initial value by default.
This article explains how to set a blank date as initial value for these
controls.

MORE INFORMATION
================

Windows Date Time Picker control and Microsoft Date Time Picker ActiveX controls
change the time back to the current date even if you set it to blank by calling
SetWindowText with a blank string as parameter.

The following steps describe a way to set a blank date as the initial value for
Microsoft Date Time Picker ActiveX control.

1. Change the format type to custom format (3) and set the custom format to
   where one blank string.m_datePicker is a member variable created for the
   Windows Date Time Picker control placed on a dialog box.

      BOOL CDtpickerDlg::OnInitDialog()
      {
          CDialog::OnInitDialog();

          SetIcon(m_hIcon, TRUE);                 // Set big icon
          SetIcon(m_hIcon, FALSE);                // Set small icon
          
          m_datePicker.SetFormat(3);         // Change the format type to    custom format.
          m_datePicker.SetCustomFormat(" "); // One blank string.

          return TRUE;  // return TRUE  unless you set the focus to a control
      }

2. Add an event handler for the Change event in your dialog class using
   ClassWizard.

      ON_EVENT(CDtpickerDlg, IDC_DTPICKER1, 2,OnChangeDtpicker1,VTS_NONE)

   NOTE: If using Visual Studio.NET do the following: In the Property browser, on
   the Events tav, add an event handler for the Change event in your dialog
   class.

3. In the event handler (OnChangeDtPicker1) change the format back to the format
   you want.

      void CDtpickerDlg::OnChangeDtpicker1() 
      {
          m_datePicker.SetFormat(1);
      }

You could use similar logic to set a blank date as an initial value for Windows
Standard Date Time Picker control.

1. Call SetFormat with one blank string as parameter.

   m_dateCtrl.SetFormat(" "); //one blank

2. Add a notification message handler for the DTN_DATETIMECHANGE message in your
   dialog class and add the following code to it. Change the format type to the
   format you want.

      void CDateTimeCtrlDlg::OnDateTimeChange(NMHDR *pNotifyStruct, LRESULT    *result)
      {
           m_dateCtrl.SetFormat(DTS_SHORTDATEFORMAT);
           *pResult = 0;
      }

(c) Microsoft Corporation 1999, All Rights Reserved. Contributions by Sreedhar
Pelluru, Microsoft Corporation.


Additional query words:

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Keywords          : kbCmnCtrls kbCtrl kbDateTime kbMFC kbVC kbDSupport kbGrpDSMFCATL 
Technology        : kbVCsearch kbAudDeveloper kbVC500 kbVC600 kbVC32bitSearch kbVCNET kbVC500Search
Version           : :5.0,6.0
Issue type        : kbhowto

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