Null value in Datetime field

I have a form that inserts data, but the date fields are getting a default value (1/1/1900 12:00:00 AM) even though I don't insert a value for that field. How would I insert a NULL value in the datatime fields in MSSQL.instead of the default value (1/1/1900 12:00:00 AM) that gets inserted?
Here is my insert statement.
<CFLOCK type="exclusive" timeout="10">
    <CFQUERY name="InsertWorkflow"
          datasource="#request.app.DSN#"
          username="#request.app.bsruser#"
          password="#request.app.bsrPassword#">
        INSERT INTO #request.app.DB#.v_NAR_WorkFlowLog
        ([SatApp_ID]
           ,[User_ReqApproval_Logon]
           ,[User_ReqApproval_Date]
           ,[Admin_ReqProcessed_Logon]
           ,[Admin_ReqProcessed]
           ,[Prelim_Approval_Level]
           ,[Prelim_Approval_Date]
           ,[Prelim_Approval_Explain]
           ,[Req_Withdrawn_Date]
           ,[Req_Withdrawn_Explain]
           ,[Req_Denied_Date]
           ,[Req_Denied_Explain]
           ,[User_Req_FinalAppl_Date]
           ,[Admin_FinalAppl_Date]
           ,[DateLastUpdated]
           ,[UpdatedBy])
        VALUES
           (#SatApp_ID#
           ,'#User_ReqApproval_Logon#'
           ,'#User_ReqApproval_Date#'
           ,'#Admin_ReqProcessed_Logon#'
           ,'#Admin_ReqProcessed#'
           ,'#Prelim_Approval_Level#'
           ,'#Prelim_Approval_Date#'
           ,'#Prelim_Approval_Explain#'
           ,'#Req_Withdrawn_Date#'
           ,'#Req_Withdrawn_Explain#'
           ,'#Req_Denied_Date#'
           ,'#Req_Denied_Explain#'
           ,'#User_Req_FinalAppl_Date#'
           ,'#Admin_FinalAppl_Date#'
           ,'#DateLastUpdated#'
           ,'#UpdatedBy#')
    </CFQUERY>
</CFLOCK>
Thanks,
Shearak

Would CFQueryParam work? For example:
<cfqueryparam cfsqltype="CF_SQL_DATE" value="#DateLastUpdated#" null = "#YesNoFormat(NOT Len(Trim(DateLastUpdated)))#">
So, using your given example, your insert would be:
<CFLOCK type="exclusive" timeout="10">
    <CFQUERY name="InsertWorkflow"
          datasource="#request.app.DSN#"
          username="#request.app.bsruser#"
          password="#request.app.bsrPassword#">
        INSERT INTO #request.app.DB#.v_NAR_WorkFlowLog
        ([SatApp_ID]
           ,[User_ReqApproval_Logon]
           ,[User_ReqApproval_Date]
           ,[Admin_ReqProcessed_Logon]
           ,[Admin_ReqProcessed]
           ,[Prelim_Approval_Level]
           ,[Prelim_Approval_Date]
           ,[Prelim_Approval_Explain]
           ,[Req_Withdrawn_Date]
           ,[Req_Withdrawn_Explain]
           ,[Req_Denied_Date]
           ,[Req_Denied_Explain]
           ,[User_Req_FinalAppl_Date]
           ,[Admin_FinalAppl_Date]
           ,[DateLastUpdated]
           ,[UpdatedBy])
        VALUES
           (#SatApp_ID#
           ,'#User_ReqApproval_Logon#'
           ,'#User_ReqApproval_Date#'
           ,'#Admin_ReqProcessed_Logon#'
           ,'#Admin_ReqProcessed#'
           ,'#Prelim_Approval_Level#'
           ,'#Prelim_Approval_Date#'
           ,'#Prelim_Approval_Explain#'
           ,'#Req_Withdrawn_Date#'
           ,'#Req_Withdrawn_Explain#'
           ,'#Req_Denied_Date#'
           ,'#Req_Denied_Explain#'
           ,'#User_Req_FinalAppl_Date#'
           ,'#Admin_FinalAppl_Date#'
           ,<cfqueryparam cfsqltype="CF_SQL_DATE" value="#DateLastUpdated#" null = "#YesNoFormat(NOT Len(Trim(DateLastUpdated)))#">           ,'#UpdatedBy#')
    </CFQUERY>
</CFLOCK>

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Please Mark This As Answer if it solved your issue
Please Mark This As Helpful if it helps to solve your issue
Visakh
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