Hi Michael Paterson,
There is no way to get the grouping to ignore the time and only group by day. Perhaps you could sort by this field instead of group by it? If you hold down SHIFT when you click on the grid column header for sorting it will allow you to sort by multiple columns.
Another thing you could do would be to customize your TFS work item template so that the work items do not contain the closed time, or so they have another field that is the date only without the time. But this is a more complex solution.
Kind regards,
Ryan
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