Learn Dutch: De aansluiting is pas om twee uur. - The connection is not until two o'clock.

The word pas contains that meaning all by itself! When used with time, pas means 'not until' or 'only at'. It tells us that the event happens later than we might have expected. You don't need a separate negative word like niet.

If I wanted to say the connection was earlier than expected, which word would replace pas?

You would use al (already). Saying De aansluiting is al om twee uur means 'The connection is already at two o'clock,' implying it is earlier than you thought and you might have to rush.

Does aansluiting refer to an internet connection here?

No, aansluiting in this context refers to a transport connection, like transferring between trains or buses. If you want to talk about an internet, phone, or Bluetooth connection, you should use the word verbinding.

Is om always the right preposition to use for clock times?

Yes! Just like you use 'at' in English for clock times, you always use om in Dutch. A quick refresher: use om for hours on the clock, op for days of the week, and in for months and years.