Time in any other frame of reference or name is a measurement. If you have any name we could use to group it, that would be cool. Don't we attach names to everything so we can I dentify what it is to our own classification? The only things that do not exist are those things which we cannot classify. I think that time is real, fluid and linear, we can classify it, wait until someone can actually change time, so far I heard it is only feasable to go forward in time, but who knows.