Solution: I found this this bugzilla comment which links to this page for time formatting. I changed intl.date_time.pattern_override.time_short to h:mm a so it shows 4:26PM. There's an open bugzilla report for my issue: Date not formatted according to user's locale (LC_TIME).

For instance, 4:26PM instead of 16:26, I'm on linux (NixOS) if that helps.