[TYPO3] GET and POST variables into TS setup

[Xatucans]

Hello, I have this url:
http://www.myurl.com/lista/?tx_cal_controller[getdate]=20061208

and I need to get the date value of the GET variable 
tx_cal_controller[getdate] and write it inside my TS setup, I write this 
code for this purpose:

plugin.tx_cal_controller.view.list.endtime= GPVar : tx_cal_controller | 
getdate

but it doesn't work.

Could anybody tell me how I can get the date value (20061208) of the GET 
variable inside my TS code? thanks