AnyTool
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How do I convert a Unix timestamp to a date?

Type a Unix timestamp into AnyTool's converter to see the date in ISO 8601, UTC, local, and relative time across any timezone — or convert a date back to a timestamp. A live epoch clock ticks in real time, all in your browser.

  • Bidirectional timestamp ↔ date with auto unit detection
  • Seconds, milliseconds, microseconds, and nanoseconds
  • Full IANA timezone picker with correct DST; live epoch clock
  • 100% in your browser — no upload, no signup, free

What is

Unix Timestamp

A Unix timestamp (epoch time) is the number of seconds (or milliseconds/micro/nanoseconds) since 1 January 1970 UTC. Converting it produces a human-readable date, and the reverse turns a date back into a timestamp.

Developer Tools

Related terms

Epoch TimeISO 8601TimezoneMilliseconds

How to Convert a Unix Timestamp

Convert between Unix timestamps and dates entirely in your browser.

10 secWeb browser
  1. 1

    Enter a value

    Type a Unix timestamp or pick a date; the unit is auto-detected.

  2. 2

    Choose a timezone

    Select any IANA timezone to format the result.

  3. 3

    Copy the output

    Copy ISO 8601, UTC, local, or relative-time values with one click.

Result: A converted timestamp or date

Frequently Asked Questions

Yes — it uses the browser's IANA timezone data for correct historical DST handling.

AnyTool formats dates with Intl.DateTimeFormat using the chosen IANA timezone, so historical dates honor the right offset and DST rules — avoiding the inaccuracy some converters warn about.

Yes — it detects seconds, milliseconds, microseconds, and nanoseconds by digit length.

Paste a 10, 13, 16, or 19-digit value and the tool detects the unit automatically (with a manual override), parsing nanoseconds with BigInt so precision is never lost.

It is free and runs entirely in your browser — nothing is uploaded.

All conversion uses native browser date APIs, so there is no server round-trip, no signup, and it works offline once loaded.

Detailed Explanation

Methodology

How Unix Timestamp Conversion Works

AnyTool converts between Unix timestamps and dates using native JavaScript Date and Intl.DateTimeFormat with a timeZone, which leverages the browser's bundled IANA timezone database for correct historical DST handling. Units are auto-detected by digit length (10=seconds, 13=milliseconds, 16=microseconds, 19=nanoseconds), with nanoseconds parsed via BigInt to avoid precision loss. Outputs include ISO 8601, RFC 2822/3339, UTC, locale, and relative time, and a live epoch clock ticks in real time. No conversion leaves the device.

  • Native Date + Intl.DateTimeFormat (accurate DST)
  • Auto unit detection: seconds/ms/µs/ns
  • Full IANA timezone picker via Intl.supportedValuesOf
  • ISO 8601, RFC 2822/3339, UTC, locale, relative time
  • Live epoch clock; no upload; works offline