ὅταν

a particle of time, compound of ὅτε and ἄν, at the time that, whenever (German dannwann;wannirgend); used of things which one assumes will really occur, but the time of whose occurrence he does not definitely fix (in secular authors often also of things which one assumes can occur, but whether they really will or not he does not know; hence, like our in case that, as in Plato, Prot., p. 360 b.; Phaedr., p. 256 e.; Phaedo, p. 68 d.); (cf. Winers Grammar, § 42, 5; Buttmann, § 139, 33);
a. with the subjunctive present: Mt 6:2, Mt 6:5; Mt 10:23; Mk 13:11 (here Rec. aorist); ; Lk 11:36; Lk 12:11; Lk 14:12; Lk 21:7; Jn 7:27; Jn 16:21; Acts 23:35; 1 Cor 3:4; 2 Cor 13:9; 1 Jn 5:2; Rev 10:7; Rev 18:9; preceded by a specification of time: ἕως τῆς ἡμέρας ἐκείνης, ὅταν etc., Mt 26:29; Mk 14:25; followed by τότε, 1 Thess 5:3; 1 Cor 15:28; equivalent to as often as, of customary action, Mt 15:2; Jn 8:44; Rom 2:14; at the time when equivalent to as long as, Lk 11:34; Jn 9:5.
b. with the subjunctive aorist: equivalent to the Latinquandoacciderit,ut with subjunctive present, Mt 5:11; Mt 12:43; Mt 13:32; Mt 23:15; Mt 24:32; Mk 4:15f, 29 (R G), 31f; 13:28; Lk 6:22, Lk 6:26; Lk 8:13; Lk 11:24; Lk 12:54; Lk 21:30; Jn 2:10; Jn 10:4; Jn 16:21; 1 Tim 5:11 (here L marginal reading future); Rev 9:5. equivalent toquando with future perfect, Mt 19:28; Mt 21:40; Mk 8:38; Mk 9:9; Mk 12:23 (G Tr WH omit; L brackets the clause), 25; Lk 9:26; Lk 16:4, Lk 16:9; Lk 17:10; Jn 4:25; Jn 7:31; Jn 13:19; Jn 14:29; Jn 15:26; Jn 16:4, Jn 16:13, Jn 16:21; Jn 21:18; Acts 23:35; Acts 24:22; Rom 11:27; 1 Cor 15:24 (here L T Tr WH present), (where the meaning is, 'when he shall have said that the ὑποταξις predicted in the Psalm is now accomplished'; cf. Meyer ad loc.); 1 Cor 16:2, 1 Cor 16:5, 1 Cor 16:12; 2 Cor 10:6; Col 4:16; 1 Jn 2:28 (L T Tr WH ἐάν); 2 Thess 1:10; Heb 1:6 (on which see εἰσάγω, 1); Rev 11:7; Rev 12:4; Rev 17:10; Rev 20:7. followed by τότε, Mt 9:15; Mt 24:15; Mt 25:31; Mk 2:20; Mk 13:14; Lk 5:35; Lk 21:20; Jn 8:28; 1 Cor 13:10 (G L T Tr WH omit τότε); 1 Cor 15:28, ; Col 3:4.
c. According to the usage of later authors, a usage, however, not altogether unknown to the more elegant writers (Winers Grammar, 309 (289f); Buttmann, 222f (192f); (Tdf. Proleg., p. 124f; WHs Appendix, p. 171; for examples additional to these given by Winers Grammar, and Buttmann, as above see Sophocles' Lexicon, under the word; cf. Jebb in Vincent and Dickson's Handbook to Modern Greek, Appendix, § 78)), with the indicative; α. future: when (Mt 5:11 Tdf.); Lk 13:28 T Tr text WH marginal reading; (1 Tim 5:11 L marginal reading); as often as, Rev 4:9 (cf. Bleek ad loc.). β. present: Mk 11:25 L T Tr WH; Mk 13:7 Tr text; (Lk 11:2 Tr marginal reading). γ. very rarely indeed, with the imperfect: as often as, (whensoever), ὅταν ἐθεώρουν, Mk 3:11 (Gen 38:9; Ex 17:11; 1 Sam 17:34; see ἄν, II. 1). δ. As in Byzantine authors equivalent to ὅτε, when, with the indicative aorist: ὅταν ἤνοιξεν, Rev 8:1 L T Tr WH; (add ὅταν ὀψέ ἐγένετο, Mk 11:19 T Tr text WH, cf. Buttmann, 223 (193); but others take this of customary action, whenever evening came (i. e. every evening, R. V.)). ὅταν, does not occur in the Epistles of Peter and Jude.