What do you mean \'Grab\' data from the URL? You mean passing it in the URL, say, from a form? That\'s easy, the variables in a form are automatically passed to the form\'s action.
If you\'re just trying to get user details or the local time, use date() or GET_REMOTE_ADDR
remember you can also echo these values in hidden form fields if you\'re trying to pass them in a URL to another page...