igGrid Group by not ignoring Time

We have a grid column that is display date in M/DD/YYYY format. The Data set for this date column includes a time value. When the user groups by this column the grouping is including the time so there are many groups for the same date. Is there a way to tell the grid to ignore the time for the grouping? I would have assumed it would grouped based on the format displayed to the user but its not working that way.

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