General :: Update Query Has Error 424 Object Required

I am trying to create an update query. I am trying to update a field in a table with the current date as a request.

I have a table named tblTest and a field named Date2 that I am trying to update with the current date, the button that the VBA is applied to is in a form name frmTest. This is my code:

Private Sub Command39_Click()
Dim t1 As Date
t1 = Date
db.Execute("update tblTest set tblTest.Date2") = t1
End Sub

But when I press the button I get:
Run time error '424'
Object Required

It highlights the 4th of code....