> ## Documentation Index
> Fetch the complete documentation index at: https://docs.erna.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# DateString

```ts theme={null}
type DateString = `${number}-${number}-${number}`;
```

A date string in ISO 8601 calendar date format (YYYY-MM-DD).

Template literal type that rejects arbitrary strings at compile time.
Use this wherever a raw date string is expected in scheduling APIs.