There are a few ways. To find the Longitude and latitude:
1. Google map your address or whatever.
2. Don't move the map around.
3. Erase your address bar and copy and paste "javascript:void(prompt('',gApplication.getMap().getCenter()));" without quotes in your address bar.
4. Those are the coordinates.
To find the timezone if you click "more info" when you look up a postal code/zip code on google maps, it will give you the time zone under the entry name
EDIT: Now that I think about it, the easiest way would be through Google Earth, as your pointer is always being tracked. Just enter the zip code and hover over the marker.
