ὁπηνίκα

1. at what point of time, at what hour, on what day , (Sophocles Tragicus), etc.; ὁπ. ἄν at whatever hour or time , (Sophocles Tragicus)

2. in indirect questions, ἢν ὥραν προσήκει ἰέναι, καὶ ὁπ. ἀπιέναι (Aeschines Orator); in answer to a direct question, πηνίκ᾽ ἐστιν τῆς ἡμέρα;—; ὁπηνίκ; what time of day is it? —; what time , do you ask? (Aristophanes Comicus): with genitive, ὁπ. τῆς ὥρας (Xenophon Historicus)

3. in a causal sense, supposing that , ὁπ. ἐφαίνετο ταῦτα πεποιηκώς (Demosthenes Orator) (ML)