# ISO 8601 Date Formatter API

> For the complete documentation index, see [llms.txt](/llms.txt).

Render one instant as ISO 8601 extended, basic, week and ordinal dates, RFC 2822, HTTP-date, and Unix time.

Use this endpoint to add the tool to your app, site, workflow, or agent without rebuilding formulas, validation, examples, and docs.

- Slug: `iso-8601-date-formatter`
- Category: `developer`
- Version: `2026-04-22`
- Credits per successful call: 1
- Starts on: free
- Max payload: 65536 bytes
- Privacy mode: `hash_only`
- Available on: free, starter, pro, business, scale
- Browser tool: https://miniwebtool.com/iso-8601-date-formatter/

## Endpoint

`POST https://api.miniwebtool.com/v1/tools/iso-8601-date-formatter/run`

## Request body

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `date` | `str` | no | ISO date, YYYY-MM-DD |
| `time` | `str` | no | HH:MM or HH:MM:SS |
| `utc_offset_minutes` | `int` | no | UTC offset in minutes, e.g. -300 |

## Example request

```json
{
  "date": "2026-07-28",
  "time": "14:30:00",
  "utc_offset_minutes": -300
}
```

## cURL

```bash
curl -X POST https://api.miniwebtool.com/v1/tools/iso-8601-date-formatter/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"date":"2026-07-28","time":"14:30:00","utc_offset_minutes":-300}'
```

## Response envelope

```json
{
  "request_id": "01K...",
  "tool": "iso-8601-date-formatter",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": {}
}
```

## Errors

Errors are RFC 7807 `application/problem+json`. Branch on `code`, not `title`.

## MCP

Agents can discover and call this tool through `https://api.miniwebtool.com/mcp` or `https://api.miniwebtool.com/v1/mcp` using MCP `tools/list` and `tools/call`.

## Frequently asked

### What does the ISO 8601 Date Formatter API do?

Render one instant as ISO 8601 extended, basic, week and ordinal dates, RFC 2822, HTTP-date, and Unix time. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

### How much does one call cost?

1 credit per successful call. Failed calls do not bill.

### What parameters are required?

Required fields: (none). Full schema at `https://api.miniwebtool.com/v1/openapi.json`.

### Is this deterministic?

Yes. Same input, same output. Tool version: 2026-04-22.