Which one are you trying to use? Just using myCalnedarF or using the popup/embedded with it?? And getting that selection to go into a subform?

Also, are you just using this for that one form to get it to work? If so, I'd just program it with hard coding instead, just Forms!FormName!SubFormName.Form!FieldName kind of thing, if you're using this everywhere, and sometimes it's going to be subform and sometimes it will be a normal form, then you'll have to code a way to detect if form or subform and two coding directions

I was trying not to change the Global Function, just change what I send to it as I use it in several forms.
I use the popup version.

The image below shows it working in the main (GREEN) form but not in the subform (RED)

If your only using it in a few spots, it would probably be easier to just add an invisible text box onto the calendar, then when you open the calendar from whatever form its on, just set the value of that textbox to 1 or 2 or whatever, then code the calendar something like

If Textbox=1 then
forms!formname!date=dateselected
ElseIf Textbox=2 Then
forms!formname!subformname.Form!Date=dateselected
End If

I will give it a try. Thank you Adam