
wann
when
Used as a question word to ask about the point in time or duration of something.
Wann kommt der nächste Bus nach Berlin?
When does the next bus to Berlin arrive?
when
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when
Used as a question word to ask about the point in time or duration of something.
Wann kommt der nächste Bus nach Berlin?
When does the next bus to Berlin arrive?

when
Used as a conjunction to introduce a subordinate clause that expresses an indirect question about a time.
Ich weiß noch nicht, wann ich morgen Zeit habe.
I don't know yet when I'll have time tomorrow.

now and then
A fixed expression that means 'sometimes' or 'occasionally'.
Wir treffen uns nur noch dann und wann auf einen Kaffee.
We only meet now and then for a coffee.
The position of the verb changes depending on the function of 'wann' (when). In a direct question, the conjugated verb is in position 2. If 'wann' introduces a subordinate clause, the conjugated verb comes at the end of the clause.
Wann fängt der Film an?
When does the film start?
'Wann' (when) is often used in typical everyday questions to ask about start and end points or schedules. Examples include 'Wann beginnt...?' (When does ... begin?), 'Wann hat ... geöffnet?' (When is ... open?), or 'Wann fährt ... ab?' (When does ... depart?).
Wann hat der Supermarkt geöffnet?
When is the supermarket open?
The expression 'dann und wann' means 'sometimes' or 'occasionally'. It is often used to describe an irregular but recurring action.
Wir gehen nur dann und wann ins Kino.
We only go to the movies now and then.
if / when
Both words can refer to a future event. „Wenn“ introduces a temporal prerequisite or condition, while „wann“ asks about the time in an indirect question. Use „wenn“ for the prerequisite and „wann“ when the time is still unknown.

Wir wissen noch nicht, wann der Zug morgen ankommt.
We don’t know yet when the train will arrive tomorrow.
Wenn der Zug morgen ankommt, holen wir dich am Bahnhof ab.
If the train arrives tomorrow, we’ll pick you up at the station.