# Relationship Calculator — MCP tool `findutils:relationship_calculator`

Calculate how long a relationship has lasted between a start date and a target date: years/months/days, totals in days, weeks, months, hours, minutes, and seconds, the weekday it started, the next anniversary, and passed/upcoming milestones (100 days to 10 years).

- Category: datetime
- MCP server: https://mcp.findutils.com/ (Streamable HTTP, no API keys, 120 req/min per IP)
- REST endpoint: POST https://api.findutils.com/api/tools/relationship-calculator/execute (no API keys, 60 req/min per IP)
- Reference page: https://findutils.com/mcp/relationship-calculator/
- Same tool on the other surface: https://findutils.com/api/relationship-calculator/

## Connect

```bash
claude mcp add findutils --transport http https://mcp.findutils.com/
```

Claude Desktop (`claude_desktop_config.json`):

```json
{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}
```

## Call the tool (verified example)

```bash
curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "relationship_calculator",
      "arguments": {
        "start_date": "2024-02-14",
        "target_date": "2026-04-18"
      }
    }
  }'
```

## Input schema

| Argument | Type | Required | Description |
|---|---|---|---|
| `start_date` | string | yes | Relationship start date (YYYY-MM-DD). |
| `target_date` | string | no | Date to measure against (YYYY-MM-DD). Default: today (UTC). |

Example arguments (verified):

```json
{
  "start_date": "2024-02-14",
  "target_date": "2026-04-18"
}
```

## Also a REST endpoint

```bash
curl -X POST https://api.findutils.com/api/tools/relationship-calculator/execute \
  -H "Content-Type: application/json" \
  -d '{
    "start_date": "2024-02-14",
    "target_date": "2026-04-18"
  }'

# Parameter schema
curl https://api.findutils.com/api/tools/relationship-calculator
```

Full REST reference: https://findutils.com/api/relationship-calculator/ · OpenAPI 3.1 spec: https://findutils.com/api/openapi.json

---
Full catalog: POST https://mcp.findutils.com/ with method `tools/list` · https://findutils.com/mcp/ · https://findutils.com/llms.txt