Learn Swedish: Hur dags kommer skjutsen på morgonen? - At what time does the ride come in the morning?

Hur dags specifically asks for a clock time (like 7:30). När is broader and could simply be answered with "later" or "tomorrow". Vilken tid means the exact same thing as hur dags, but hur dags is a classic, fixed expression that native speakers use all the time for scheduled events.

Why does dags have an -s at the end?

The -s is an old adverbial ending (a remnant from historical Swedish grammar) that turns the noun dag (day) into an expression of time. You will also recognize this historical -s ending in other words like utomlands (abroad) or vanligtvis (usually).

What exactly is skjutsen, and how do you handle that skj- spelling?

It is the definite form of en skjuts, which means a ride or a lift (like getting a lift to the airport). The skj- letter combination creates the Swedish sje-sound (/ɧ/), which is related to the English sh sound but is usually pronounced further back in the throat, depending on the regional dialect.

Why do we use the definite form in på morgonen instead of just saying på morgon?