If you want the date, without time, to use the following:
<cfquery name="qInsert" datasource="#dbanme#" >
INSERT INTO TableName( ...., date_created, date_modified )
VALUES ( ...
, <cfqueryparam cfsqltype="cf_sql_date" value="#now()#">
, <cfqueryparam cfsqltype="cf_sql_date" value="#now()#">
)
</cfquery>
cf_sql_date , 00:00:00 .
:
<cfquery name="qInsert" datasource="#dbanme#" >
INSERT INTO TableName ( ....,date_created, date_modified )
VALUES ( ...
, <cfqueryparam cfsqltype="cf_sql_timestamp" value="#now()#">
, <cfqueryparam cfsqltype="cf_sql_timestamp" value="#now()#">
)
</cfquery>