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RadDatePicker losing format on Postback

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This is a migrated thread and some comments may be shown as answers.
Chance
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Chance asked on 08 Jun 2016, 03:26 PM

I have the format set to be M/d/yyyy, and it works when selecting a date but if there is any postback on the page it changes for format to use the dashes like M-dd-yyyy.  Any ideas how to fix this?

 

 

<telerik:RadDatePicker ID="radGridDate1" Runat="server" SelectedDate='<%# DateTime.Parse( Eval("Date", "{0:M/dd/yyyy}")) %>' Width="100px" Skin="Bootstrap" >
                                                 <Calendar EnableWeekends="True"  ShowRowHeaders="false" Skin="Bootstrap" > </Calendar>
                                                 <DateInput DateFormat="M/d/yyyy" DisplayDateFormat="M/d/yyyy" LabelWidth="40%">
                                                     <EmptyMessageStyle Resize="None" />
                                                     <ReadOnlyStyle Resize="None" />
                                                     <FocusedStyle Resize="None" />
                                                     <DisabledStyle Resize="None" />
                                                     <InvalidStyle Resize="None" />
                                                     <HoveredStyle Resize="None" />
                                                     <EnabledStyle Resize="None" />
                                                 </DateInput>
                                                 <DatePopupButton HoverImageUrl="" ImageUrl="" />
                                            </telerik:RadDatePicker>

Thanks

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Vasil
Telerik team
answered on 09 Jun 2016, 12:24 PM
Hi Chance,

The slash(/) is special symbol in the date format string, and it is culture dependent:
https://msdn.microsoft.com/en-us/library/8kb3ddd4%28v=vs.110%29.aspx#dateSeparator
It is used as "Date Separator" and will be changed with "-" can be changed "." according to the current culture.

So you should escape it using back slash(\). Like "M\/dd\/yyyy"

See this documentation for further information:
https://msdn.microsoft.com/en-us/library/8kb3ddd4%28v=vs.110%29.aspx

If you are setting the format using C# code you should escape the back slash as well as required in the language syntax.

So the correct code will be:
<telerik:RadDatePicker ID="radGridDate1" Runat="server"
SelectedDate='<%# DateTime.Parse( Eval("Date", "{0:M\\/dd\\/yyyy}")) %>' >
<DateInput DateFormat="M\/d\/yyyy">
</DateInput>
</telerik:RadDatePicker>

Regards,
Vasil
Telerik
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