If our universe is expanding in space, is it also expanding in time?

we see evidence that distant galaxies but not the local planets are getting farther apart. we theorize that the empty space between is expanding

who can we observe any time effects?

as far as I know it is a fun mental assumption the basic physical laws of the universe are the same in all times and all places, the details of course change.

we measure time by observing changes of things that we think occur at regular intervals.

I cannot imagine any way to measure if time itself changed and for example if some hours were longer or shorter than others. the clocks would still count one hour at a time

In order to answer the question, you have to understand the idea behind a space-time metric. A space-time metric defines the separation between two space-time points. The space-time separation between two space-time points is agreed upon by all frames of reference (all observers regardless of motion which give it objective meaning). However, different frames of reference (observers in relative motion) will assign different values to the spatial separation and different values to the temporal separation between the two space-time points. Therefore space by itself and time by itself have no objective universal meaning - the whole point of relativity.

So, the question of whether time by itself is "expanding" really has no meaning. The integrated space-time is expanding, but you cannot separate the two in any meaningful, reference frame independent, objective way.

Think of it this way: Our universe is the source of all planets gravity, holding all our galaxy's in it's tight grip (Gravity). Every planet is moving in a random direction depending on it's gravity. Our moon is moving Away from our earth about 1cm a year because it has a very low gravitational pull. Still the sources of all planets can move. It's complicated...

This documentary may enlighten you...

http://www.youtube.com/watch?v=1yTfRy0LTD0&playnex...

...the universe may not be expanding at all.

Whoa!! If thats true then there is no end, no edge of the universe... Mind blowen