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Free dates & numbers tool

Unix timestamp converter

Convert Unix seconds, milliseconds, ISO, RFC, or date text to UTC, local time, ISO 8601, and both epoch units instantly in your browser.

Runs locallyUpdates as you type
Output
Your result will appear here.
Processed only on this device

About this tool

What unix timestamp converter does

Translate Unix seconds, Unix milliseconds, or parseable date text into ISO 8601, UTC, local time, and both epoch units side by side.

How it works

Choose automatic epoch detection, explicit seconds, explicit milliseconds, or date text. Browser Date parsing produces the same instant as ISO 8601, UTC, local display, seconds, and milliseconds.

Common uses

When to use it

  • Decode timestamps from logs, APIs, and database exports
  • Compare an epoch value with an ISO 8601 timestamp
  • Identify accidental seconds-versus-milliseconds mistakes

Scope

Limits to know

  • Local output uses the timezone configured on the current device
  • Leap-second representation follows standard browser Date behavior

Worked example

Example input and result

Use the prefilled value in the tool above or paste a similar value of your own.

Input
1767225600
Result
UTC: 2026-01-01T00:00:00.000Z · Seconds: 1767225600 · Milliseconds: 1767225600000

Quick answers

Unix timestamp converter FAQ

Are Unix timestamps in seconds or milliseconds?

Traditional Unix time uses seconds. JavaScript and many web systems commonly use milliseconds, so this converter detects and displays both.

What timezone is a Unix timestamp in?

A Unix timestamp represents an instant relative to UTC. Timezone only affects how that instant is displayed.

Why does my converted date look wrong?

The most common cause is treating a millisecond timestamp as seconds, or the reverse.

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