Appointment can be fixed for next seven days only from current day

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ASP.NET

Javascript

function validateDate()
            {
                        serverDateTime="2012-11-23 17:06:46";
                txtDate.value="30-Nov-2012"

                if (how i check here)
                {
                           alert("Appointment can be fixed for next seven days only from current day.");
                    return false;
                }
                else
                {
                    return true;
                }
            }

i m getting serverDateTime on master page load and access that variable in all pages and comparing serverDateTime with txtDate.value how i validate Appointment can be fixed for next seven days only from current day.