Facts of Reality
Time does not exist. Movement, however, does. Gotta reverse everything to bring everyone back.
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From what I've gathered about reality, there isn't a past somewhere waiting for someone to traverse it, for that you would need to reverse everything. It doesn't exist anymore. The movement has passed. There is a new configuration. There is only the present; the past is gone, but may be retrieved if we reverse everything.
Earth & the Sun have changed, the cause & effect chains have shifted, matter has been dispersed, reorganized, but not just here, everywhere shifts.
There is only ever NOW continually.
NOW is the current configuration, but it is a changing one, as movement, unlike time, is very real. So there was a past, obviously, but it doesn't exist anymore because reality and that which it is comprised of (lets say particles and forces) has changed locations, shifted, and is now configured differently.
I.e Time has passed, but time doesn't exist. What really happened was movement occurred and realities configuration is now changed, but, of course, it updates continually -- the cause and effect chains. Remember, however, that as a lifeform that can choose, regardless of it being cause & effect, you must still choose, and let that choice be to work to Achieve Reality Respected.