Meaning of “when” - Learner’s Dictionary

when

adverb us uk /wen/
Extra Examples
When are you going to retire?When will you finish painting the bedroom?When did you hear the news?When did this happen?When do you get your results?

A1 used to ask at what time something happened or will happen:

When's your birthday?
When did he leave?
When are you going away?

(Definition of “when adverb” from the Cambridge Learner’s Dictionary © Cambridge University Press)