"Class is at 1:00 pm."

[Keniko1]

Why awakea and not 'auinalā?

[Komota15]

The short answer is that Hawaiian breaks up the day into blocks of hours as opposed to slightly nebulous "morning" "afternoon" and "evening/night". Ka awakea pertains to those midday hours, ka auinala more to what we might express as later afternoon hours ( after 2:00)