# Date Math Calculator (remote · apished.com)

Date arithmetic: day differences, business days, age, leap years, day-of-week, add/subtract.

- Trust score: 65/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-20

## Components

- remote · `apished.com`: 65/100 (this document), [markdown](https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath.md), [page](https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath)

## Channel facts

- Endpoint: `https://apished.com/mcp/v1/datemath`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-20.

- **Endpoint Security**: 60/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 79/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 424 tokens (~70/item across 6 items; 6 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 92/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 71% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http com-apished-date-math-calculator https://apished.com/mcp/v1/datemath
```

### Codex

```toml
[mcp_servers.com-apished-date-math-calculator]
url = "https://apished.com/mcp/v1/datemath"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-apished-date-math-calculator": {
      "type": "remote",
      "url": "https://apished.com/mcp/v1/datemath",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-apished-date-math-calculator --url https://apished.com/mcp/v1/datemath --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-apished-date-math-calculator:
    url: "https://apished.com/mcp/v1/datemath"
```

### Other

```json
{
  "mcpServers": {
    "com-apished-date-math-calculator": {
      "type": "http",
      "url": "https://apished.com/mcp/v1/datemath"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-20 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-19 (score 64, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-08-18 (score 64)

First indexed and scored.

## MCP tools (6)

### `datemath_add` (~108 tokens)

Adds years/months/days to date. years/months are applied together with end-of-month clamping — e.g. 2026-01-31 + 1 month = 2026-02-28, not an overflowed 2026-03-03. days is then applied as plain calendar-day arithmetic.

Input parameters:

- `date` (string, required): YYYY-MM-DD
- `days` (integer)
- `months` (integer)
- `years` (integer)

### `datemath_age` (~77 tokens)

Age in whole years as of asOf (optional, defaults to the current UTC date). A Feb-29 birthDate is treated as falling on March 1 in a non-leap asOf year.

Input parameters:

- `asOf` (string): YYYY-MM-DD, defaults to today
- `birthDate` (string, required): YYYY-MM-DD

### `datemath_businessdays` (~104 tokens)

Counts days in [from, to] (inclusive on both ends) whose weekday is in weekdays (default mon-fri) and which aren't in holidays.

Input parameters:

- `from` (string, required): YYYY-MM-DD
- `holidays` (null|array): YYYY-MM-DD dates to exclude
- `to` (string, required): YYYY-MM-DD
- `weekdays` (null|array): sun/mon/tue/wed/thu/fri/sat, default mon-fri

### `datemath_dayofweek` (~50 tokens)

Day of the week for date: both the weekday name and its ISO 8601 weekday number (1=Monday..7=Sunday).

Input parameters:

- `date` (string, required): YYYY-MM-DD

Output parameters:

- `dayOfWeek` (string)
- `isoWeekday` (integer)

### `datemath_diff` (~54 tokens)

Day difference between two YYYY-MM-DD dates: to minus from, in whole days. Negative if to is before from.

Input parameters:

- `from` (string, required): YYYY-MM-DD
- `to` (string, required): YYYY-MM-DD

### `datemath_leapyear` (~31 tokens)

Checks whether year is a leap year in the Gregorian calendar.

Input parameters:

- `year` (integer, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath#diagnostics

## Score history

- 2026-08-20: 65
- 2026-08-19: 64
- 2026-08-18: 64

## Links

- Remote endpoint: https://apished.com/mcp/v1/datemath
- Website: https://apished.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath.json
- HTML version of this page: https://verifymcp.io/servers/com-apished-date-math-calculator/mcp-v1-datemath