Meaning of GNU find options: -mtime, -ctime, -atime

[Dan Jenkins]

VirginSnow at vfemail.net wrote:
>  A question was raised recently on the list about the exact meaning of
>  arguments to GNU find's -mtime test.  While I've been able to get by
>  for years without understanding the exact semantics, I decided was
>  for me to "dig in" and learn how exactly this works.
>
>  Here's what I found (no pun intended).  If anyone finds any mistakes
>  in this description, please holler... loudly. :)

Just what I've needed for years and never took the time to understand fully.
Thank you.