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Hi staddum,

welcome to the board!

Just call \date before \maketitle instead of after it.
Btw. a minimal code example should be compilable (here's \end{document} missing), further the forum has a code environment for posting code, for better readability. Just mark your code and press the Code ...

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[portuguese]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{graphicx}



\title{Apontamentos Introdução à Fisica Moderna - Física quântica}
\author{staddum}
\begin{document ...

Hi there, this is my first post.

I've been using LaTeX for two days now, that meaning that I'm as noob as one can be. I use MiKTeX with TeXworks and I've a question.

Whenever I try \date{whateverdateifeellikewriting}, it doesn't work. It seems like the date updates from my system and I'd like to ...