I am sure that a lot of people asked this question but when I checked the answers it seems to me that they are wrong that what I found
var startDate = new Da
Note that Date.getDate only returns the day of the month. You can add a day by calling Date.setDate and appending 1.
// Create new Date instance
var date = new Date()
// Add a day
date.setDate(date.getDate() + 1)
JavaScript will automatically update the month and year for you.
EDIT:
Here's a link to a page where you can find all the cool stuff about the built-in Date object, and see what's possible: Date.