Thank you for the additional information.
In order change the format of the date, you will need a custom DateTimeGroupDescription as in the CustomDateTimeGroupDescription
example. I have modified the example in order to keep the default DateTime steps and I am attaching it for your reference.
As for adding additional Datetime nodes in the Date folder, you can override the GetFieldDescriptionHierarchy method of the custom LocalDataSourceFieldDescriptionsProvider and add a new FieldInfoNode.
I hope you find this helpful. Don't hesitate to contact us again if you have any other questions.
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