Grouping of items in ListView WPF

I have a ListView where I want to group the items based on a field of the item object. Below is the code I have:

<ListView ItemsSource="{x:Bind MyVM.CollectionOfClassA, Mode=OneWay}"<ListView.GroupStyle><GroupStyle><GroupStyle.HeaderTemplate><DataTemplate><TextBlock FontSize="15" FontWeight="Bold" Text="{Binding DateTimePropertyOfClassA}"/></DataTemplate></GroupStyle.HeaderTemplate></GroupStyle></ListView.GroupStyle></ListView>

Is there something I am missing? I want to group the items based on the DateTime property of ClassA objects. Also, if there is no item for any particular day, I would still like to show that date with empty list under that group (for that day). How can I achieve it?

Edit: I am not able to use CollectionViewSource since my VM contains the collection of ClassA object (which is bound as item source to the listview) and I want to group the items based on one property of those ClassA objects. I am sure there is something I am missing out on. But I am not able to figure it out.