A.T. Robertson Commentary Luke 5:35

"But the days will come; and when the bridegroom shall be taken away from them, then will they fast in those days." — Luke 5:35 (ASV)

Then in those days (τοτε εν εκειναις ταις ημεραις). Here Mr 2:20 has "then in that day," and Mt 9:15 only "then."