Sub or Function in VBA Excel - vba

Question

I'm trying to create a function or sub to create a report in VBA Excel. I want the user to Enter two dates into two separate text boxes. Then when the submit button is clicked it checks if the text boxes are empty or not then if they aren't it preforms the CreateReport() Sub or function which creates a new sheet and appends data to it. Here is my code:
Userform2:
Private Sub Cancel_Click()
Unload Me
End Sub
Private Sub Submit_Click()
If UserForm2.Date1.Value = "" & UserForm2.Date2.Value = "" Then
Value1 = UserForm2.Date1.Value
Value2 = UserForm2.Date2.Value
CreateReport(Value1,Value2)
End If
End Sub
Private Sub UserForm_Initialize()
Date1.SetFocus
Dim Value1 As String
Dim Value2 As String
End Sub
Module1:
Option Explicit
Public Function CreateSheet(Name1 As String, Name2 As String)
Dim WS As Worksheet
Dim FullName As String
FullName = Name1 & "-" & Name2
Set WS = Sheets.Add.Name = FullName
End Function
Public Sub CreateReport(Date1 As String, Date2 As String)
End Sub

Answer 1

You're calling CreateReport when there are no dates entered...
Also
CreateReport(Value1,Value2)
should be
CreateReport Value1, Value2
you don't use parentheses unless you're calling a function or using the Call keyword.
And
Set WS = Sheets.Add.Name = FullName
should probably be
Set WS = Sheets.Add()
WS.Name = FullName