modify cfdquery

I have the query which work just fine. Now i was told to add 1 more column into the table to record first time login. So if the first time login is blank then put current date, if not empty then do nothing . How can i achive this

<cfquery name="putLoggedIn" datasource="cfelsunrise" dbtype="ODBC">		<!--- Update Employee's records --->
		update Employee
			set LastLoginDate = GetDate(),
             FirstLOginDate=<cfif FirstLoginDate eq ''>=GetDate()</cfif>
		where EmployeeID = #session.EmpID#
	</cfquery>

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