Neopian time is the same for all players and can't be changed.
It's impossible to changed the NST on Neopets. NST, which stands for Neopets Standard Time is based on the time in which Neopets runs, which, I believe, is Pacific time. If it doesn't match the time in your time zone, don't fret. NST cannot be changed, and you must follow it to do dailes, such as the Snowager of the Tombola.
Simple! First what you want to do is click on the "My Account" button. Next what you would want to do is scroll down, and there, you'll find a link that says "Edit Pet Page".Click on that, and you'll be on the page you need to be in order to edit your pet page. My username on Neopets is flying4you. Don't hesitate to neomail me!
New neopets are created periodically so it is entirely possible, but unknown at the time.
From 12:00-1:00 midnight neopets time.
Neopets launched this customising project on April 26th 2007 along with their new site layout.To make the neopets able to wear the clothes, they had to change them a little.
Once a pet is created you can't change its name.
Yes neopets may change hit points.
Since customization became available you cannot change the position of your Neopets.
they HAD to. here, this link will explain it: http://www.neopets.com/bleh.phtml
Any time!
You have to approach him on a special time.
No.