It’s quite simple, create a new date, get the day and the year increase them and return a new date with the new values.
This is a DEMO returning a date increased with one day and one year from the current one.
var date = new Date();
document.write(date);
var month = date.getMonth()+1;
var day = date.getDate();
var year = date.getFullYear();
var newDate = new Date(month+"-"+(day+1)+"-"+(year+1));
document.write("<h3>"+newDate+"</h3>");
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solved Using Javascript how to add days and years to the current date?