Revelation 12 "I looked when He opened the sixth seal, and behold, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became like blood. 13 And the stars of heaven fell to the earth, as a fig tree drops its late figs when it is shaken by a mighty wind. 14 Then the sky receded as a scroll when it is rolled up, and every mountain and island was moved out of its place. 15 And the kings of the earth, the great men, ]the rich men, the commanders, the mighty men, every slave and every free man, hid themselves in the caves and in the rocks of the mountains, 16 and said to the mountains and rocks, “Fall on us and hide us from the face of Him who sits on the throne and from the wrath of the Lamb! 17 For the great day of His wrath has come, and who is able to stand?”
There might be a hint as to when in the year the day of the Lord will begin because of the expression late figs in the above passage. The original Greek word is ὄλυνθος (Strong's G3653 - olynthos) which is also translated as untimely figs and winter figs.
"Probably the unripe figs of the spring, many of which would be shaken down by a strong wind, or possibly the winter figs, which commonly fall off while unripe." - Pulpit Commentary
"The “untimely fig” is the fig which, having formed too late to ripen in the autumn, hangs through the winter, but almost always drops off before the sap begins to rise in spring, so as not to come to maturity." - Cambridge Bible for Schools and Colleges
So we should not be surprised if the nuclear war begins in late winter/early spring.
What year ? Well the exact middle of the last week in Daniel 9 when some sort of destruction is prophecied is March 6 2019.