Dynamic default values in parameters

Hello,
anyone knows if it's possible to set dynamic values as default values for parameters in portal?
i am specially interested in the use the date we are in to pass it to a discoverer worksheet (month or year) via single parameter form or any other porlet that could perform it.
Many thanks.
Regards,
Daniel
PS
Is the second thread i create with this question cause i didnt receive any answer before and i am really interested in any solution or knowing that i cant perform it.

no one have ever used a date parameter (for example, month) that need a default value, and set this default value as the month we are today?
maybe i didnt explain my problem properly before...
thanks for any help, i really need this because all the porlets in the portal i am creating are discoverer's reports that presented by month, year or day.
regards,
daniel

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