The Three Days of Darkness can still occur during December 27th thru December 29th, 2018 A.D.
Luke 21 :
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, by reason of the confusion of the roaring of the sea and of the waves;
26 Men withering away for fear, and expectation of what shall come upon the whole world. For the powers of heaven shall be moved;
27 And then they shall see the Son of man coming in a cloud, with great power and majesty.
28 But when these things begin to come to pass, look up, and lift up your heads, because your redemption is at hand.
N.B. - this may happen again
The current window for the Three Days of Darkness is November 24-26, 2016 A.D.
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St. Elijah (cf. §784, Catholic Catechism),
St. John the Baptist (cf. §785, Catholic Catechism),
Edward Popovich Palamar (cf. §786, Catholic Catechism),
the Resurrected Prophet of the Most High (Luke 1:76),
whom Jesus Christ calls "the Elias who was to come" (Matthew 11:14),
enjoying the rapture of Christ's love in the duty of
Petrus Romanus (Peter the Roman, cf. St. Malachy Prophecy),
the resurrected angel of Exodus 23:20,
the sign of the Son of Man in Heaven (Matthew 24:30)