At the time of an event, contingent on that event happening at all.

(law, finance, business) Used to indicate the timing and contingency of some obligation in contracts, especially financial.

word you use to ask about the time or day

(idiomatic) An imperative form used to request that the interlocutor indicate when one should stop doing something, esp. pouring a drink, because one has reached a sufficient amount.

(idiomatic) as for; with regard to (phrase used to introduce a new topic)

Alternative form of way back when

Alternative form of way back when

Alternative form of when it comes to (used for things in the past)

(idiomatic, by ellipsis) Adjust to local customs.

(colloquial, rhetorical question, sarcastic) From what time. / (colloquial, rhetorical question, sarcastic) (as an interrogative interjection) Used to indicate doubt as to the veracity of a statement.