to display date by calculating : how can i dispaly the date to exactly after 2 years depending on the user entered date.....by the way i am using "input type=date" method......can you just provide me ideas of dispalying the exact 2 years after date

example: if a users enters the date in the text box using the calender i need the date to be exactly 2 years after to be displayed in the otheer text box 

example 1: if i enter date in the text box (lets just take its as some product manufacture date), i want it to automatically calculate the the entered date and display the 2 years later on date(the expiry date)

by the i am using javascript.......i am happy if i get any ideas based on html, jquery