When applying for a job, you usually look at the academic certificate.

Academic certificate is a graduation certificate issued by a school or other educational institution that implements academic education within the academic system to an educated person who has completed a learning task at an educational stage within the academic system.

As the name implies, "education" means learning, learning history or experience. Therefore, a diploma is a certificate to prove one's academic experience.

A diploma issued by an educated person upon graduation is a diploma, and a part-time diploma is a diploma.