# ISO Strings and Template Literals

Your code builds interval strings using `toISOString()` and a template literal.

## Example

```ts
const interval = `${start.toISOString()}/${end.toISOString()}`;
```

## Why this format is good

- ISO format is unambiguous.
- Easy for backend APIs to parse.
- Includes timezone info (`Z` for UTC).

Example value:

```text
2026-03-23T23:00:00.000Z/2026-03-30T22:00:00.000Z
```

This describes one weekly period as `start/end`.