The filter (yesterday, today, specific date) for DateTimeColumns only work for data without time portions. If the data contains date with time values the filters are useless.
I've changed the behavior for the yesterday/today filter with the OnFilterPopupRequired event (https://docs.telerik.com/devtools/winforms/gridview/filtering/excel-like-filtering) Is there any simple way to override the behavior for the calendar element? (select a specific date the filter has to be for the entire day 00:00 to 23:59, so it needs be a composite filter >= and <)
Anyway: the filters should work for date and datetime data by default