I have an object that looks like this:

```js
const availability = {
        week1: {
            mon: false,
            tue: true,
            wed: true,
            thu: true,
            fri: false,
        },
        week2: {
            mon: false,
            tue: true,
            wed: true,
            thu: true,
            fri: false,
        },
        week3: {
            mon: false,
            tue: true,
            wed: true,
            thu: true,
            fri: false,
        },
        week4: {
            mon: false,
            tue: true,
            wed: true,
            thu: true,
            fri: false,
        },
    };
```

This shows the availability of someone on the 1st, 2nd, ... week of the current month.

What I now need is the date of each day that is true. So for example the date of tuesday on the first week of this month, the date of tuesday for the second week of the month and so on.

I have checked out date-fns and moment.js but I can not figure out how I'd tackle this issue.