Display Date Format

[nbahl]

Hi,
Is there a way to format the display date, instead of mm/dd/yyyy I need to just display mm/yyyy.  I don't see the DisplayDateFormat property available in WPF, is there a way to do this?

Thanks,
Nate

[Hristo]

Hello nbahl,

First I want to apology for the late answer.
You can set the culture property of RadDatePicker and customize the Culture ShortDatePattern property in order to change the date format.
Here is a snippet changing the display date to MM/yyyy.

CultureInfo cultureInfo = new CultureInfo("en-US");
DateTimeFormatInfo dateInfo = new DateTimeFormatInfo();
dateInfo.ShortDatePattern = "MM/yyyy";
cultureInfo.DateTimeFormat = dateInfo;
radDatePicker1.Culture = cultureInfo;

Let me know if you need more information.

Sincerely yours,
Hristo
the Telerik team

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[nbahl]

Worked perfectly....thank you.

[nbahl]

Hristo,

I have run into a problem when using this code.  If I pick a date from the calendar it works perfectly, but if I type in a date I get an error "Object reference not set to an instance of an object".  Below is the stack trace if that helps.  I am on Q1 2009 release.  Also is there a way to create a shortcut for entering the current date? Ex. if a user enters "/" it defaults in todays date.

Thanks!
Nate Bahl


   at Telerik.Windows.Controls.DatePicker.DateTimeParsing.DateTimeEvaluator.GetFirstAvailablePosition(Token token, Dictionary`2 inputBuckets)
   at Telerik.Windows.Controls.DatePicker.DateTimeParsing.DateTimeEvaluator.Distribute(Token[] originalTokens)
   at Telerik.Windows.Controls.DatePicker.DateTimeParsing.DateTimeEvaluator.GetDate(Token[] tokens, DateTime date)
   at Telerik.Windows.Controls.DatePicker.DateTimeParsing.TripletEntry.Evaluate(DateTime currentDate, FormatInfo formatInfo)
   at Telerik.Windows.Controls.DatePicker.DateTimeParsing.DateTimeEntry.Evaluate(DateTime currentDate, FormatInfo formatInfo)
   at Telerik.Windows.Controls.RadDatePicker.ParseDateAndUpdateTextBox()
   at Telerik.Windows.Controls.RadDatePicker.OnInputBoxLostFocus(Object sender, RoutedEventArgs e)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.OnLostFocus(RoutedEventArgs e)
   at System.Windows.Controls.Primitives.TextBoxBase.OnLostFocus(RoutedEventArgs e)
   at System.Windows.UIElement.IsFocused_Changed(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.Controls.TextBox.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
   at System.Windows.DependencyObject.ClearValueCommon(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata)
   at System.Windows.DependencyObject.ClearValue(DependencyPropertyKey key)
   at System.Windows.Input.FocusManager.OnFocusedElementChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType)
   at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Input.FocusManager.SetFocusedElement(DependencyObject element, IInputElement value)
   at System.Windows.Input.KeyboardNavigation.UpdateFocusedElement(DependencyObject focusTarget)
   at System.Windows.FrameworkElement.OnGotKeyboardFocus(Object sender, KeyboardFocusChangedEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.KeyboardDevice.ChangeFocus(DependencyObject focus, Int32 timestamp)
   at System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus, Boolean askOld, Boolean askNew)
   at System.Windows.Input.KeyboardDevice.Focus(IInputElement element)
   at System.Windows.UIElement.Focus()
   at System.Windows.Input.KeyboardNavigation.Navigate(DependencyObject currentElement, TraversalRequest request, ModifierKeys modifierKeys, DependencyObject firstElement)
   at System.Windows.Input.KeyboardNavigation.Navigate(DependencyObject sourceElement, Key key, ModifierKeys modifiers)
   at System.Windows.Input.KeyboardNavigation.ProcessInput(InputEventArgs inputEventArgs)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndKeyboardInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawKeyboardActions actions, Int32 scanCode, Boolean isExtendedKey, Boolean isSystemKey, Int32 virtualKey)
   at System.Windows.Interop.HwndKeyboardInputProvider.ProcessKeyAction(MSG& msg, Boolean& handled)
   at System.Windows.Interop.HwndSource.CriticalTranslateAccelerator(MSG& msg, ModifierKeys modifiers)
   at System.Windows.Forms.Integration.ElementHost.ProcessCmdKey(Message& msg, Keys keyData)
   at System.Windows.Forms.Control.PreProcessMessage(Message& msg)
   at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg)
   at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at WinFormTestControl.Program.Main() in C:\rccdev\utilnxt\net\BankReconcilation\WinFormTestControl\Program.cs:line 18
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

[Miroslav]

Hello Nate,

It seems that there is a bug in the DateTime parser. It expects the day component of the date to always be there. We have logged this as an issue and it will be fixing it for the next SP or Q2 release.

Your Telerik points have been updated for the bug report.

As for your second question: you can register for the KeyDown event and change the date there, like so:

    datePicker.KeyDown += new KeyEventHandler(datePicker_KeyDown);

void datePicker_KeyDown(object sender, KeyEventArgs e)
{
    if (e.Key == Key.Subtract)
    {
        var datePicker = sender as RadDatePicker;
        datePicker.SelectedDate = DateTime.Now;
        e.Handled = true;
    }
}

All the best,
Miroslav
the Telerik team

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[James]

Is there any way to set the display date format using only XAML?

[Boyan]

Hi James,

 For now there is no way to set the format in XAML. You have to set it in code.

All the best,
Boyan
the Telerik team

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[matt]

The date picker parser problem mentioned above (null ref exception when using a date format without days) still exists in the q2 release.

[Boyan]

Hi matt,

Yes, this is not fixed. We are reworking RadCalendar and RadDatepicker for Q3. We are making major structure changes of this two controls as  current implementation is not good enough and SL3 was released which gives the opportunity for some improvements. That's why we have frozen all fixes for the current implementation.
 Sorry for the inconvenience caused. You can expect improved version of this controls for Q3.

Regards,
Boyan
the Telerik team

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[matt]

If the controls are being reworked a simple way to make the date picker a month picker or a year picker would be good. I.e. Select a month and have that set the selected date to the first day of the month instead of drilling down into the day view. I have this working with the current control but it was not straight forward. It required a month template with a button and the click event can be handled etc. Even a click event on CalendarButton would be good and a way to cancel the default behaviour of drilling down to the day view. With a display format on the text box of MMM yyyy it would make a simple month picker. Currently we have to live with what feels like a hacky solution and a date format that includes the days. A way to disable the parser altogether would be good and I am guessing stop problems like the one in this thread if it is not required.

[Henrique Duarte]

Hello matt,

I'm waiting for this implementation too.
I opened a support ticket for that with a sample code:

private void RadDatePicker_DisplayModeChanging(object sender, CalendarModeChangedEventArgs e)
{
    if (e.NewMode == DisplayMode.MonthView)
    {
        e.Cancel = true;
        ((RadDatePicker)e.Source).SelectedDate = ((RadDatePicker)e.Source).Calendar.CurrentDate;
    }
}

The are two problems:
1 - They don't have *YET* a "DisplayModeChanging" method, only "DisplayModeChanged";
2 - The Calendar is private, so we cannot access the CurrentDate.

If we have luck, maybe this implementation will be on next build.

Best regards,

Henrique

[Kaloyan]

Hi Henrique Duarte,

We appreciate you suggestion and will consider such features for the Q3 2009 release. Thanks once again.


Sincerely yours,
Kaloyan
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[Suman]

Hi,

I have added your code snippet, but could not resolve. Can you send more details xaml and code.

EG, CultureInfo cultureInfo = new CultureInfo("en-US");

DateTimeFormatInfo dateInfo = new DateTimeFormatInfo();

dateInfo.ShortDatePattern = "MM/yyyy";

cultureInfo.DateTimeFormat = dateInfo;

radDatePicker1.Culture = cultureInfo;

Thanks
Suman

[Yana]

Hi Suman,

Please check the following article which demonstrates how to set a custom date format to the RadDateTimePicker control:
http://www.telerik.com/help/wpf/raddatetimepicker-features-formatting.html

I hope this helps.

Regards,
Yana
Telerik