Free Unix epoch and ISO converter
Paste any timestamp — epoch seconds, epoch milliseconds, ISO 8601, RFC 2822, or natural language. Auto-detects. Converts to every format + world timezones.
All calculations run in your browser using native Date + Intl APIs. Nothing uploaded.
Frequently asked
How does auto-detect work?
Numbers < 10¹² = seconds. Numbers ≥ 10¹² = milliseconds. Everything else goes through Date.parse which handles ISO, RFC 2822, and most common formats.
Why is epoch important?
Unix epoch (seconds since 1970-01-01 UTC) is the universal machine-readable time format. Databases, logs, and APIs commonly use it.
Are 32-bit timestamps a concern?
Yes — the Year 2038 problem. Signed 32-bit epoch overflows on 2038-01-19. This tool uses JS Numbers (safe until ~year 275,000).
Is my input sent anywhere?
No. Native Date + Intl only. Zero network requests.
Free?
Yes.