But it will be the end of consciousness and the end of perception as we know it."


That's what I think will happen, the ego will collapse and with it the linear time/space. It will happen when the magnetic poles of the earth shift (not physical shift of the crust). This process takes some time, could be days / years but I don't know what the effect is on the mind (because the ego is death/dying)
I don't know when this will happen because the (our) calendars were messed up, but looking outside, connecting the dots of events that happen now.
Looking at ancient 'calendars' we can see that different cycles come to end now in the years / centuries to come, it's the end of the iron age, the end of a great cycle of one Maya calendar, the beginning of Aquarius (the destroyer), the time of purification (Hopi)
Some of these 'prophecies' will have only a local effect, some global, some physical, some of the mind/dna.