# PlainlyKit — Date API

**Canonical:** https://apis.io/providers/plainlykit/  
**Website:** https://plainlykit.com  
**APIs profiled:** 1

PlainlyKit provides a free public Date API that adds a whole number of weeks to a given Gregorian date. The service returns the resulting date, the weekday, and the total elapsed days, all in JSON format. No API key, signup, or account is required, and the API operates over simple GET requests. It is intended for developers needing quick calendar arithmetic without authentication. The site also hosts a collection of other free online tools.

## Kin Score — 13.6 / 100 (emerging)

Scored 2026-11-13 under rubric 0.28.0.

| Facet | Score |
|---|---|
| Discoverability | 66.1 |
| Contract Quality | 6.7 |
| Contract Governance | 22.0 |
| Operational Transparency | 0.0 |
| Developer Ergonomics | 9.5 |
| Access Clarity | 8.5 |

Regulatory layer — **Horizontal (data, software, accessibility, platform)**: 8.8 (matched via fallback).

## Agent readiness — 4.9 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | no |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | no |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |
| Pagination Ratio | na |
| Operation Distinctiveness | na |
| MCP Tool Quality | na |

## Access

Open access — onboarding: open, pricing: unknown, trial: no (confidence: low).

## APIs (1)

- **Date API** — Add weeks to a Gregorian date and get resulting date, weekday, and elapsed days. No authentication required.

## Agentic access (1)

- **PlainlyKit — Date API Agentic Access** — 1 operation

## Security (1)

- **PlainlyKit — Date API Domain Security** — TLSv1.3

## Tags

Company, Date, Calendar, Free, Public

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/plainlykit/). Scores are computed from the provider's own public artifacts under a published rubric.