[technobabbler]

That doesn't help people who don't know what am/pm are. 11:59pm would be 23.59 in some places (like Finland).

It's possible to mix up dates and times from each other too (is 12.30 Dec 30 or half past noon?)

[orev]

11:59 pm is 23:59 by all definitions.

Why GP would have exams at midnight is anyone’s guess, but the example can only be interpreted as just before midnight.