# Understanding `alignedStarts`

`alignedStarts` is an array of date boundaries that match your backend schedule rule.

## Concept

```ts
const alignedStarts: Date[] = [];
```

Each item is a valid period boundary (for example Monday 00:00 in backend-local schedule terms).

Later, you form intervals by pairing adjacent items:

```ts
const start = alignedStarts[index];
const end = alignedStarts[index + 1];
```

So if `alignedStarts` has `N` items, you can make up to `N-1` intervals.

## Why this is useful

- Keeps schedule boundaries consistent.
- Makes interval generation deterministic.
- Handles DST-safe boundaries when generated correctly.