Passing a NULL value to a column from an Update query - sql

Question

Update to Question:
Background. I am using SQL Server as a backend to my Access Database.
I have created this Stored Procedure (Update Query) that I run by way of a Passthrough query from MS Access. The process works fine with one exception.
If one of the date fields being passed to the update query is null then 1900-01-01 gets inserted into the column instead of leaving (making) it empty. I tried setting the default value to NULL but did not work. The date columns have date as their data type.
MS Access Side of things:
qry_PT_sp_UpdateTable_Club = exec sp_UpdateTable_Club
Button that Runs the process:
Private Sub btn_Save_Click()
'Tests that a club has been selected
mod_ClubSelectTest.ClubSelectTest
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'Creates values to be used by sp_UpdateTable_Club
strSQL = "exec sp_UpdateTable_Club '" & txt_Club_ID & "'," & _
" '" & txt_FSM_ID & "', '" & txt_Receiver_ID & "', '" & txt_ClubType_ID & "', '" & txt_ClubNumber & "'," & _
" '" & txt_ClubName & "', '" & txt_EIN & "', '" & chk_1st & "', '" & chk_2nd & "', '" & chk_3rd & "'," & _
" '" & chk_4th & "', '" & cbo_MtgDay_Member & "', '" & txt_MtgTime_Member & "'," & _
" '" & cbo_MTGDay_Trustees & "', '" & txt_MTGTime_Trustees & "', '" & txt_Notes & "'," & _
" '" & txt_Phone_Primary & "', '" & txt_Extension_Primary & "', '" & txt_Phone_Secondary & "'," & _
" '" & txt_Extension_Secondary & "', '" & txt_Address_1_P & "', '" & txt_Address_2_P & "'," & _
" '" & txt_City_P & "', '" & cbo_State_P & "', '" & txt_ZIP_P & "'," & _
" '" & Nz(txt_Address_1_M, Null) & "', '" & txt_Address_2_M & "'," & _
" '" & txt_City_M & "', '" & cbo_State_M & "', '" & txt_ZIP_M & "'," & _
" '" & Opt_AffliationAgreemet & "', '" & opt_990 & "', '" & opt_ByLaws & "', '" & opt_HouseRules & "'," & _
" '" & opt_Officers & "', '" & opt_TrialCommittee & "', '" & opt_FinanceCommitee & "'," & _
" '" & opt_Auditor & "', '" & opt_Invoice & "', '" & opt_Insurance & "', '" & txt_CharterSuspended & "'," & _
" '" & txt_AgentAssigned & "', '" & opt_CharterRequest_Type & "', '" & txt_RequestedDate & "' "
CurrentDb.QueryDefs("qry_PT_sp_UpdateTable_Club").SQL = strSQL
DoCmd.SetWarnings False
DoCmd.OpenQuery "qry_PT_sp_UpdateTable_Club"
DoCmd.SetWarnings True
End Sub
Stored Procedure sp_UpdateTable_Club
#Club_ID int,
#FSM_ID int,
#Recever_ID int,
#ClubType_ID int,
#ClubNumber int,
#ClubName nvarchar(50),
#EIN nvarchar(50),
#MTGWeek_1 bit,
#MTGWeek_2 bit,
#MTGWeek_3 bit,
#MTGWeek_4 bit,
#MTGDay_Members int,
#MTGTime_Members nvarchar(5),
#MTGDay_Trustees int,
#MTGTime_Trustees nvarchar(5),
#Notes nvarchar(max),
#PhonePrimary nvarchar(15),
#ExtensionPrimary nvarchar(6),
#PhoneSecondary nvarchar(15),
#ExtensionSecondary nvarchar(15),
#Address1_P nvarchar(50),
#Address2_P nvarchar(50),
#City_P nvarchar(50),
#State_Province_ID_P nvarchar(50),
#PostalCode_P nvarchar(50),
#Address1_M nvarchar(50),
#Address2_M nvarchar(50),
#City_M nvarchar(50),
#State_Province_ID_M nvarchar(50),
#PostalCode_M nvarchar(50),
#AffiliationAgreement bit,
#990 bit,
#ByLaws bit,
#HouseRules bit,
#Officers bit,
#TrialCommittee bit,
#FinanceCommittee bit,
#Auditor bit,
#Invoice bit,
#Insurance bit,
#CharterSuspended date,
#ReceiverAssigned date,
#CharterRequest_Type_ID int,
#RequestedDate date
AS
Begin
UPDATE Club set FSM_ID = #FSM_ID,
Receiver_ID = #Recever_ID,
ClubType_ID = #ClubType_ID,
ClubNumber = #ClubNumber,
ClubName = #ClubName,
EIN = #EIN,
MTGWeek_1 = #MTGWeek_1,
MTGWeek_2 = #MTGWeek_2,
MTGWeek_3 = #MTGWeek_3,
MTGWeek_4 = #MTGWeek_4,
MTGDay_Members = #MTGDay_Members,
MTGTime_Members = #MTGTime_Members,
MTGDay_Trustees = #MTGDay_Trustees,
MTGTime_Trustees = #MTGTime_Trustees,
Notes = #Notes,
PhonePrimary = #PhonePrimary,
ExtensionPrimary = #ExtensionPrimary,
PhoneSecondary = #PhoneSecondary,
ExtensionSecondary = #ExtensionSecondary,
Address1_P = #Address1_P,
Address2_P = #Address2_P,
City_P = #City_P,
State_Province_ID_P = #State_Province_ID_P,
PostalCode_P = #PostalCode_P,
Address1_M = #Address1_M,
Address2_M = #Address2_M,
City_M = #City_M,
State_Province_ID_M = #City_M,
PostalCode_M = #PostalCode_M,
AffiliationAgreement = #AffiliationAgreement,
[990] = #990,
ByLaws = #ByLaws,
HouseRules = #HouseRules,
Officers = #Officers,
TrialCommittee = #TrialCommittee,
FinanceCommittee = #FinanceCommittee,
Auditor = #Auditor,
Invoice = #Invoice,
Insurance = #Insurance,
CharterSuspended = #CharterSuspended,
ReceiverAssigned = #ReceiverAssigned,
CharterRequest_Type_ID = #CharterRequest_Type_ID,
RequestedDate = NULLIF(#RequestedDate, CONVERT(DATE, '1900-1-1')
Where Club_ID = #Club_ID;
end
SELECT * From Club;