Amy good introduction to Relativity (caution, do NOT try to read after the first Bourbon) will help with the presentation of time as a spatial dimension.
Haddon's excellent novel The Curious Incident of the Dog in the Night-Time,
which I cannot recommend strongly enough, not only shows how to tesselate St. George's crosses (knowledge without which my life was incomplete) but also presents a very easy way to understand time as truly spatial.
But once you've eaten of that tree, then the math for "many dimensions" becomes easy enough to understand, though incredibly tedious to do.
I couldn't begin to tell you "where" time is. :)
That-a-way.
Thanks for bringing back the horrors of multi-variable calculus. So much for my plans of being a math major. :)
And thanks for the tip on Haddon's novel. I have a book which I've never finished called "About Time" by Paul Davies. I have to keep re-reading over the same sections, so I've never finished it. :) But I like it anyway.