Function toISODate

toISODate(date: Date): string
Converts a date to an ISO 8601 date-only string (YYYY-MM-DD).
Parameters
- date: Date
  The input date.
Returns string
ISO date string.
Example
```
toISODate(new Date('2025-07-23T12:34:56Z')); // → '2025-07-23'
```
- Defined in date/utils.ts:39