Change Current Date in DateField and Load Different Date as Current Date

Hi,

            I'm Trying to Change Current Date in DateField and Load Different Date as Current Date is it possible.                                                     

We may follow two methods. one is have to override Date() that's native method, of DateField loads form Flashplayer want to override that,

Another method is create custom date Field with one TextInput and icon. at the time of clicking icon we can show DateChooser In that dateChooser we can hide todays style by mark [showToday="false"] , and how to set style for particular date. we can try this method for Normal DateField too.

Please tel me how to override sytem date before it load and displayed in datechooser, and How to set style for a particular date,

I neeed this urgenly.please...

Thank you in Advance.