How do you say Good afternoon in Welsh?

There are two common ways to say "Good afternoon" in Welsh, depending on the formality:

Formal: Prynhawn da (pronounced "pryn-hown da")

Informal: Prynhawn dda (pronounced "pryn-hown dda")

The only difference between the two is the accent mark on the "a" in the formal version. While both are acceptable, the formal version is more commonly used in professional or written contexts.