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Unix Timestamp Converter — Epoch to ISO, UTC & Local Dates

Convert Unix timestamps (seconds or milliseconds) to ISO, UTC, RFC 2822, local, and relative formats. Live "Now" panel.

Free No signup Client-side Privacy friendly Updated

Auto-detects seconds vs milliseconds. ISO 8601 strings also accepted.

Converted

Invalid input.

Now (live)

How to use

  1. 1 Paste a Unix timestamp (seconds or milliseconds) or any ISO 8601 / RFC 2822 date string into the input.
  2. 2 The Converted panel shows the date in every common form, including a relative phrase like "3 days ago".
  3. 3 The Now panel refreshes every second so you can grab the current Unix time at a glance.
  4. 4 Use Copy on any row to push it to your clipboard.

Why use this tool

  • Auto-detects seconds vs milliseconds — no more accidentally dividing by 1000.
  • Shows ISO, local, UTC, RFC 2822, and a relative form in one view.
  • Live "Now" reference, useful when you need to script the current timestamp.
  • Runs in your browser — no clock skew from a server.

Frequently asked questions

How does it tell seconds from milliseconds?

Any input ≥ 1e11 is treated as milliseconds. That threshold corresponds to year ~5138 in seconds, but only March 1973 in milliseconds — so it correctly classifies every real-world timestamp.

What does "negative timestamp" mean?

Unix timestamps before 1970-01-01 UTC are negative. The tool handles them — try -2208988800 for 1900-01-01.

Need this value in a different timezone?

Use our Timezone Converter — paste the ISO output, then pick source and target zones.

How do I add hours to this timestamp?

Convert it to ISO, then use the Date Calculator in Add mode for calendar arithmetic.

What is Unix Timestamp Converter?

A Unix Timestamp Converter is a tool that translates Unix epoch timestamps, in seconds or milliseconds, into human-readable date formats and back. It runs in the browser and outputs ISO, UTC, RFC 2822, local, and relative representations, with a live "Now" panel showing the current timestamp as it updates.

Features

Two-way conversion

Epoch → human date and date → epoch, in seconds or milliseconds.

Multiple formats

ISO 8601, UTC, RFC 2822, local, and relative ("3 hours ago") output at once.

Live "Now" panel

See the current Unix time tick in real time for quick reference.

Example

Input

1700000000

Output

ISO 8601 (UTC): 2023-11-14T22:13:20Z
RFC 2822:       Tue, 14 Nov 2023 22:13:20 +0000

Common use cases

  1. 1

    Debug logs and databases

    Turn an epoch value from a log line or DB column into a readable date.

  2. 2

    Set API time parameters

    Produce the exact epoch value an API expects for a since/until filter.

  3. 3

    Sanity-check expiry times

    Decode a token or cache exp field to confirm when it actually expires.

Summary

Zerethon's Unix timestamp converter translates epoch seconds or milliseconds into ISO 8601, UTC, RFC 2822, local, and relative dates — and converts a date back to an epoch value — in your browser. A live "Now" panel shows the current timestamp. Everything runs client-side.

Category
Developer
Pricing
Free
Privacy
Browser-based
Signup
Not required

References

Privacy

Your data never leaves your browser unless explicitly stated. Unix Timestamp Converter runs entirely client-side — no server upload, no logging, no tracking of your input.

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