Parallel passages can not be interpreted to have polar opposite meanings.
When we compare the parallel accounts in Matthew and Luke, we see they are speaking of the exact same event:
-COMPARE THIS-
Matthew 24:15-21
15 “Therefore when you see the ‘abomination of desolation,’ spoken of by Daniel the prophet, standing in the holy place” (whoever reads, let him understand), 16 “then let those who are in Judea flee to the mountains. 17 Let him who is on the housetop not go down to take anything out of his house. 18 And let him who is in the field not go back to get his clothes. 19 But woe to those who are pregnant and to those who are nursing babies in those days! 20 And pray that your flight may not be in winter or on the Sabbath. 21 For then there will be great tribulation, such as has not been since the beginning of the world until this time, no, nor ever shall be.
-TO THIS-
Luke 21:20-23
20 “But when you see Jerusalem surrounded by armies, then know that its desolation is near. 21 Then let those who are in Judea flee to the mountains, let those who are in the midst of her depart, and let not those who are in the country enter her. 22 For these are the days of vengeance, that all things which are written may be fulfilled. 23 But woe to those who are pregnant and to those who are nursing babies in those days! For there will be great distress in the land and wrath upon this people.
Both above passages speak of the same "
When" the same "
Desolation" the same "
time to flee", the same "
those days of woe to the pregnant and nursing" and the same "
Great Tribulation/Distress.
These two, separate-but-parallel, synoptic accounts are of the exact same discourse Given by Jesus, to the exact same apostles, at the exact same moment, covering the exact same subject.
Again, Parallel passages CANNOT be interpreted in a way thet renders their individual meanings be anything BUT entirely PARALLEL to one another.