@schngn/engine

Pure TypeScript date arithmetic for the ordinary Schengen 90/180-day rule. The package has no browser, Cloudflare, persistence, telemetry, or network dependency.

Most integrations should use @schngn/capability, which adds strict versioned schemas and fixed advisory metadata.

npm install @schngn/engine

import { calculateUsageOnDate } from '@schngn/engine';

const result = calculateUsageOnDate(
  [{ entryDate: '2026-01-01', exitDate: '2026-01-12' }],
  '2026-02-01'
);

Each stay range represents continuous physical presence inside Schengen. Entry and exit days both count. This is calculation software for planning, not legal advice or a guarantee of entry.

See the agent setup guide for the CLI, loopback OpenAPI, and MCP interfaces.