# timenowin.ai — full capability summary

timenowin.ai is a single-page web application that serves as a high-precision
world clock and a machine-readable time API.

## Time accuracy

The browser client synchronizes against multiple time sources (Cloudflare's
trace endpoint and others) using Cristian's algorithm with rolling-median
outlier rejection. Re-syncs every 60 seconds and on visibility change. UI
ticks via requestAnimationFrame, not setInterval, to avoid drift on
backgrounded tabs.

## HTTP API

GET /api/now?tz=Europe/London
Returns:
  iso        ISO 8601 with milliseconds, UTC
  unix_ms    integer milliseconds since epoch
  unix_ns    string nanoseconds since epoch
  tz         echoed IANA zone
  offset_min minutes east of UTC for that zone
  drift_ms   server-side drift estimate
  source     provenance string

Headers: Access-Control-Allow-Origin: *, Cache-Control: no-store.

## MCP tools

get_time(tz?), list_timezones(query?), compare_zones(a, b),
next_event(tz, kind). Schemas at /.well-known/mcp.json.

## Privacy

No analytics, no cookies, no third-party JS at runtime. Pinned cities are
stored in the user's browser localStorage only.