To update the value of a cookie, just assign a new value to the cookie name:

document.cookie = 'name=Flavio2'

Similar to updating the value, to update the expiration date, reassign the value with a new expires or max-age property:

document.cookie = 'name=Flavio; max-age=31536000' //expires in 1 year

Just remember to also add any additional parameters you added in the first place, like path or domain.

Lessons in this unit:

0:	Introduction
1:	Setting cookies
2:	Setting a cookie expiration date
3:	Setting a cookie path
4:	Setting a cookie domain
5:	Cookies security
6:	▶︎ Updating a cookie
7:	Deleting a cookie
8:	Accessing the value of a cookie
9:	Checking if a cookie exists
10:	Inspecting cookies
11:	Cookie not being set in Safari