importance: 4

---

# Uppercase const?

Examine the following code:

```js
const birthday = '18.04.1982';

const age = someCode(birthday);
```

Here we have a constant `birthday` for the date, and also the `age` constant.

The `age` is calculated from `birthday` using `someCode()`, which means a function call that we didn't explain yet (we will soon!), but the details don't matter here, the point is that `age` is calculated somehow based on the `birthday`.

Would it be right to use upper case for `birthday`? For `age`? Or even for both?

```js
const BIRTHDAY = '18.04.1982'; // make birthday uppercase?

const AGE = someCode(BIRTHDAY); // make age uppercase?
```