They are not necessarily positive. If you're talking about scientific/mathematical calculations of time, then only half are positive ;).
If you are talking about how we in america culturally refer to time in day to day speech and thought, I think that's a question having to do not with time itself, but with the society that refers to it as important only when perceiving it in one direction; forward. (subjectively, of course, compared to other, older, societies around the world)
In many other cultures when telling time in day to day speech it is common to say "H minus mm" or "without mm, H" as would be closer to a direct translation. Those would be considered a negative interval, moving backwards, while telling time.
To better answer your question, I would need clarification on what you mean.
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Yes, but most of the time we use intervals of 1.
The positive regions of a function are those intervals where the function is above the x-axis. It is where the y-values are positive (not zero). The negative regions of a function are those intervals where the function is below the x-axis. It is where the y-values are negative (not zero).
Time interval is the period of time between the start and end of an activity.
No the second is broken down into smaller intervals of time.
Time intervals of ten seconds.