We will do our best to have date filters in our Q2 release. For the moment there's no workaround that you can use.
I'm not sure I fully understand your idea of changing DateTimeGroupDescription output format. When you use this kind of grouping, you have to set a step for the groups (by default it is set to Year). So data in RadPivotGrid
is shown based on this step (ex. 2010, 2011...). If you would like to see the full date and group by it, you can replace DateTimeGroupDescription with PropertyGroupDescription in your code. This way each day will be treated as a string and grouped only by this string representation. We have not considered changing the string format of DateTimeGroupDescription as it is showing group - year, month, quarter, not particular date.
Could you try using PropertyGroupDescription and also send us more details for your case? I'm looking forward to hearing from you.
the Telerik team