i want to disply today date as a water mark

Question

Dear all,

 

 

 

i want to disply by default today date in textbox as a watermark and 

while iam focusing means entered some data i want show only selected data

 

like by default i have textbox disply currentdate

 

at the same time that textboxhavin callender extender so after selecting that i want show only selected date

please help me