how do I combine multiple dates in datesBlacklist props?

I have some problem combining two forms of Date. What I mean is how do I achieve the blacklist date for all weekends and some dates on weekdays? Think this is as some people only work weekdays and their weekend is off. If they take some PTO during weekdays, I want to show them all together.

```
const datesBlacklistFunc = date => {
return date.isoWeekday() === 6; // disable Saturdays
}; // this will return all saturdays for many years
```

and

```
const datesBlacklist = [
{ start: '2021-12-25', end: '2021-12-25' },
{ start: '2021-12-31', end: '2021-12-31' },
];

```

I want to combine those two above situations in date Blacklist, any help will be appreciated?