Add current date to tag

I fetch playcount/listeners from last.fm and want to save the query date in a custom field. For e.g. in %date_updated%.

Currently I am doing it in 2 steps. First I fetch the meta data using the scripts. Next I use %_date% in actions to save the current date in the custom field.

Is it possible to output the current date to a tag in the web source script itself?