Hola @agamez ,
Hablo un poquito en Espanol; lo siento. Bienvenidos a la comunidad.
Sounds like you want to give an extension to a particular student. If you want to give one student a different time/date to complete a Canvas assignment, then that is referred to as a differentiated assignment. This link should be helpful:
How do I assign an assignment to an individual student?
Alternatively, if you want a student to have extra time to complete a quiz (ie they get 60 minutes to complete a test versus the rest of the class whom gets 30 minutes); this link would be helpful:
https://community.canvaslms.com/docs/DOC-13053-4152276279
Let us know if that was able to help you!
Sky V.
