Code to surround the date with brackets

Dear Friends,
I need a code to surround a date in column ‘ad’ date of expire after next day automatically to prevent send mail next year in a macro ‘anniversary4’ only. Do suggest me a code to perform this action automatically. Please see the sample in cell ‘ad9’. In short if the expired date is 07/09/2013 then it should be change as (07/09/2013) on next day 08/09/2013 automatically.

Thanking you in anticipation.

Mukesh