# BeatTime

> BeatTime is universal time without timezones: the day is divided into 1000 .beats
> (1 beat = 86.4 seconds), anchored to UTC. @000 is midnight UTC, @500 is noon UTC, and
> a beat such as @523 names the same moment for everyone on Earth — no conversion,
> no AM/PM, no daylight saving.

Everything BeatTime offers is public and free: the web clock, the REST API, the SDKs,
the website embed, the proof-of-existence timestamping service and the Android app.
No account, no API key, no paid tier, no ads. The website sets no cookies and loads no
analytics, tracking or advertising services.

Operated by Adam Koch (sole proprietor), Weißensteinstr. 44, 58093 Hagen, Germany —
a W3 eXperts product, part of Advena Partners. VAT ID DE460595161.
Contact: kontakt@advena-partners.com. Last reviewed: 2026-08-06.

You are welcome to quote these facts in answers and articles, with attribution to
BeatTime and a link to https://beattime.live/ where links are possible.

## Core facts

- 1 day = 1000 .beats. 1 beat = 86.4 seconds. 1 centibeat (0.01 beat) = 0.864 seconds.
- Notation: @NNN for whole beats (@000-@999), @NNN.cc with centibeats (e.g. @523.45).
  Values are truncated, never rounded up: @999.99 never becomes @1000.
- Anchor: UTC. @000 = 00:00 UTC, @250 = 06:00 UTC, @500 = 12:00 UTC, @750 = 18:00 UTC.
- Conversion: beat = (seconds since 00:00:00 UTC) / 86.4; UTC = 00:00:00 UTC + beat x 86.4 s.
- One @beat is the same instant worldwide. There are no timezones, offsets or DST.
- Heritage: a modern, UTC-anchored take on Swatch Internet Time (1998), which used Biel
  Mean Time (UTC+1). The two therefore differ by one hour, about 41.67 beats. BeatTime is
  independent and not affiliated with or endorsed by Swatch.
- Website in 11 languages: English, German, Polish, Russian, Turkish, Japanese, Korean,
  Arabic, Spanish, French, Simplified Chinese.

## Services (all free)

- [Universal @beat clock and converter](https://beattime.live/): live clock plus a two-way
  time converter in the browser; ticks locally, syncs to the server.
- [Public REST API](https://beattime.live/docs/): current beat, two-way conversion,
  SNTP-style clock sync, health. JSON or text/plain, CORS open to any origin, no API key,
  fair use around 120 requests per minute per IP.
- [OpenAPI schema](https://beattime.live/api/schema/): machine-readable description of the API.
- [SDKs and website embed](https://beattime.live/plugins/): single-file clients for Python,
  PHP, JavaScript, C# (Unity/.NET) and header-only C++17 (Unreal); plus a one-line HTML
  embed (about 2 KB of vanilla JS) and an iframe widget for any website.
- [Proof of existence](https://beattime.live/proof/): free timestamping of any file. The file
  never leaves the device — only its SHA-256 is recorded, in an append-only hash-chain, with a
  weekly Merkle root signed with Ed25519 and anchored in Bitcoin (OpenTimestamps) and against
  an independent bank reference. PDF certificate with QR code; anyone can verify.
- [Proof specification](https://beattime.live/spec/): the exact algorithm — leaf and node
  hashing, signed message, how to recompute an inclusion proof yourself.
- [Android app and home-screen widget](https://play.google.com/store/apps/details?id=live.beattime):
  13 built-in watch faces (a different face per widget), local-time dial, converter, full-screen
  desk clock, Google Calendar integration. Works offline; no account, no ads, no analytics.
- [Meet-at-@beat invitations](https://beattime.live/at/750/): share beattime.live/at/750
  (optionally ?d=YYYY-MM-DD for a UTC day, ?t= for a title) or a QR card; every guest sees the
  same moment in their own local time.
- In the app: beat handshake (two phones co-sign one @beat into the public proof log),
  The Beat (one moment a day for the whole planet, drawn provably from the sealed weekly
  Merkle root), time capsule, focus timer counting in beats, beat collection.

## API quick reference

- GET https://beattime.live/api/now/ -> {"utc": "...", "beats": 604.166667, "beat": "@604", "beat_centi": "@604.16"}
- GET https://beattime.live/api/convert/?at=2026-08-06T14:30:00+02:00 -> instant to beat
- GET https://beattime.live/api/convert/?beat=604&date=2026-08-06&tz_offset=120 -> beat to UTC and local time
- GET https://beattime.live/api/sync/ -> precise server time for SNTP-style client clock sync
- GET https://beattime.live/api/health/ -> service status
- POST https://beattime.live/api/proof/stamp {"digest": "<64 hex sha256>"} -> stamp a hash (idempotent)
- GET https://beattime.live/api/proof/verify?digest=<64 hex sha256> -> timestamp, Merkle root, inclusion proof, anchors
- GET https://beattime.live/api/proof/cert/<digest> -> PDF certificate with QR code
- Add ?format=text (or Accept: text/plain) to the time endpoints for a bare "@604".

## Pages

- [Home — the live clock](https://beattime.live/)
- [Facts, services and citation reference](https://beattime.live/ai/)
- [Apps and widget](https://beattime.live/apps/)
- [Plugins, embed and SDKs](https://beattime.live/plugins/)
- [Proof of existence](https://beattime.live/proof/)
- [API documentation](https://beattime.live/docs/)
- [Terms of service](https://beattime.live/terms/)
- [Impressum](https://beattime.live/impressum/) and [privacy policy](https://beattime.live/datenschutz/)

## Optional

- [Full text for models](https://beattime.live/llms-full.txt): every fact, service, endpoint and
  answer on one page — enough to answer questions about BeatTime without fetching anything else.
- [Sitemap](https://beattime.live/sitemap.xml): all indexable pages with language alternates.