Problem updating a Date value into Access DB



I have tried everything with updating a database record and it still
errors on the date.

I have tried the following
SQL_query_courseUpd = "UPDATE courses SET date = '#" & date1 & "#'
WHERE courseID = '" & courseID & "'"

SQL_query_courseUpd = "UPDATE courses SET date = #" & date1 & "# WHERE
courseID = '" & courseID & "'"

SQL_query_courseUpd = "UPDATE courses SET date = " & #date1# & " WHERE
courseID = '" & courseID & "'"


Which ones am i missing?

Thank you

.