I use a Jquery date-picker for a start and end date, what I would like to do is when the user changes the 'start' date, the 'end' date automatically changes to the start date + X days? 

What would others suggest the best way of doing this? I am using GB dates so its `dd/mm/yyyy` so doesn't work out of the box with the JavaScript date object? am sure this is trivial for a more experienced jQuery folk!