A free, privacy-first online Unix timestamp and date converter. Convert timestamps, compare timezones, calculate relative time, and batch-process multiple timestamps — fast, in your browser. Everything runs in the browser; no data is sent to any server.
- Unix ↔ Date Conversion — Paste a Unix timestamp (seconds or milliseconds) to get a human-readable date, or enter a date to get the Unix timestamp. Auto-detects 10-digit (seconds) vs 13-digit (milliseconds) input.
- Current Timestamp Display — Live-updating Unix timestamp (seconds + milliseconds) that refreshes every second, with one-click copy.
- Multi-Format Output — View the same moment as Unix (s), Unix (ms), ISO 8601, RFC 2822, UTC string, localized date, and relative time ("3 hours ago" / "3天前").
- Timezone Converter — Convert dates between any timezones using the full IANA timezone database via
Intl.supportedValuesOf('timeZone'). Handles daylight saving time automatically. - Relative Time Calculation — Uses
Intl.RelativeTimeFormatwith locale support (English and Chinese). - Batch Conversion — Paste multiple Unix timestamps (one per line) and convert them all at once.
- 100% Private — All conversions happen in your browser using native
DateandIntlAPIs. No data is ever uploaded. - Free Forever — No limits, no ads, no signup, no hidden fees.
npm install
npm run devnpm run buildProduces a static export in out/ ready for Cloudflare Workers static assets.
Licensed under the GNU Affero General Public License v3.0 — see LICENSE.
Free to use, modify, and self-host. If you run a modified version as a network service, you must open-source your modifications (AGPL §13). For commercial licensing without copyleft obligations, contact support@shuttlelab.org.