The phrase ἐς τὸν Μουνιχιῶνα μῆνα functions as a temporal adverbial of the 'time within which' (tempus quo), a construction rare in Attic comedy where the preposition ἐς ('into') typically denotes direction or extent of action rather than a specific month. Here, it likely implies the duration of the accusation or the specific timeframe of the 'hubris' charged against Pisthetaerus, possibly alluding to the festival period associated with the Piraeus demesmen (Mounichioi) during which such legal or social transgressions were most palpable or prosecuted. The specific reference to 'the month of Mounichion' (roughly May-June) anchors the accusation to a precise civic calendar point, contrasting with the more generic 'hubris' charge.