Original GI date should display closest day when Saturday and Sunday comes

Hi Guys,

I am getting Original GI Date as After deducting Transit time from Original Delivery Date.

But i want to fullfill the below requiremnt also.

the Original GI Date should be then the working day defined in the calendar of the shipping point. Thus if the calculation gives Original GI Date to be Sunday 4.3.2012 then it should changed to the closest previous working date which is Friday 2.3.2012 (calendar 'YT').

Any one help me how to execute the above requiremnt.

regards

reddy.