Here's what I would do :
Dim StrToday as String = Format(Now, "dd/MM/yyyy")
...
Dim cmd As OleDbCommand = New OleDbCommand("DELETE FROM Table1 Where EndDate < " & StrToday & " ;", con)
....
In MySQL you need to reverse the date, from :
"dd/MM/yyyy" become "yyyy/MM/dd".
I don't know in Access...