I mean can time be controlled within an area or even a small portion of space?
I would like to mention time-bombs, which either reverse time in a radius of explosion or take time forward. Also nanobots which can control time within tiny areas.
Time span can be controlled.
Is this theoretically possible from what we know about time or is it only fiction?
I have an interesting theory that time can really be controlled locally. There of course is a blended edge at which locally controlled time is blended with current time. However, locally controlled time works differently for objects that were or will be there before or after the current time for the span set and objects that weren't there in the past or won't be there in the future throughout the time span set.
I mean if you reverse time for a zone or take it forward, the slip-through objects were there or will be there for only a certain amount of time (they simply slip-through this area on their way) and thus can't exist there for more or less than that very time. However objects which were there all the time can be reversed to a point back in time, but objects which are taken forward much depend on what could happen in the future to this object, thus it can either stay in that area and we'll see its future in the current time, or it will disappear in the time zone. But since local time is ahead and global time is behind, we won't have this object anywhere anymore, because in our time outside the time zone it doesn't yet exist, but within the time zone at that future time it doesn't already exist.
The human idea is the same.
Imaging you (you-1) are walking with a reversing time bomb in your hand and stop suddenly because you see yourself (you-2) appearing out of nowhere. You-2 starts talking to you and you-1 answer, this goes on for some time until you find yourself (you-1) walking forward while you-2 starts slowly disappearing and then you come to the spot where you-2 was, turn around and throw the reversing time bomb at the spot you were several minutes before. At this moment you become you-2, but in fact you are you-1, whereas you holding a time bomb appears in the local time becomes you-1, while in fact he is you-2. Current you-1 cannot intersect with you-2 outside of what had been done before, you-1 do exactly the same movements the previous you-2 did and say the same words.