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About the time of the end of Lent (midnight of Holy Saturday).
Spending the days of the saving Passion in fasting, prayer and contrition of heart, the faithful must end the fast (ἀπονηστίζεσθαι) around the middle hours of the night after Holy Saturday, because the divine evangelists Matthew and Luke, the first saying after the Sabbath, and the second very early, point us to deep night.
Greek original
Τὰς τοῦ σωτηρίου πάθους ἡμέρας, ἐν νηστείᾳ, καὶ προσευχῇ, καὶ κατανύξει καρδίας ἐπιτελοῦντας, χρὴ τοὺς πιστοὺς περὶ μέσας τῆς περὶ τὸ μέγα σάββατον νυκτὸς ὥρας ἀπονηστίζεσθαι, τῶν θείων Εὐαγγελιστῶν Ματθαίου καὶ Λουκᾶ, τοῦ μέν, διὰ τοῦ, Ὀψὲ σαββάτων ῥήματος· τοῦ δέ, διὰ τοῦ Ὄρθρου βαθέος, τὴν βραδύτητα τῆς νυκτὸς ὑπογραφόντων.
Parallel canons
Ап.515366IVВс.16Трул.1355Анкир.14Гангр.1821Лаод.294951