RSFORM Mapping article Current date time

Detail: RSFORM mapping create new article submit. Mapping CreateDate is the same format database datetime.
#Step 1: Add 1 input-text name 'CreateDate' - class hidden (invisible)
#Step2: Add default value:
//<code>
return date('o-m-d H:i:s');
//</code>
This return value the same format database datetime save.

Time zone - example GTM+10
//<code>
$date = date("Y-m-d H:m:s", (time()-(60*60*10)));
return $date;
//</code>
#Step3: mapping add createdate field: {CreateDate:value}