EXT Ext@nt Restricted I would say he would erase the day Krona did his experiment, but it would prolly happen just the next day.Nethier of them can do anything to each other really.
BIG bigbran Dead Anti- Moniter could utterly destroy him, so I'm pretty sure, that Extant would be the only one, not being able to do anything to him.
EXT Ext@nt Restricted Is the Anti-moniter susepable to time alteration? Extant has survived entropy before so I don't see what Anti-monitor can do to him.