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Timestamp Converter

Turn Unix seconds or milliseconds from logs and APIs into readable dates, and the other way around. Nothing is uploaded.

Processed in your browser

Conversion runs in this browser. We do not send pasted timestamps or datetimes.
Timestamp conversion finishes in this browser. Pasted values stay on this device and are not uploaded.

Examples: 1700000000, 1700000000000, 2023-11-14T22:13:20Z

Advanced options

Paste a timestamp or datetime, then convert.

Features

Both directions

Convert Unix time to a date, and ISO or wall-clock time back to Unix seconds and milliseconds.

Unit detection

Tell seconds from milliseconds, microseconds, and nanoseconds by magnitude — or lock the unit.

Time zones

Read the instant in UTC plus everyday zones such as Tokyo and New York.

Current time

Load this device's current instant as Unix seconds and ISO 8601.

How to use

  1. Paste a Unix timestamp or a datetime.
  2. Choose Convert. Use Now when you need the current instant.
  3. Check seconds, milliseconds, ISO, and the time zone, then copy if needed.

Why this tool

Runs in the browser

Core work finishes in this tab.

No upload

Pasted text and local files are not sent away for processing.

Free, no account

The core path has no signup wall.

Immediate

There is no upload-and-wait queue.

10 languages

The same tool ships in ten languages.

Readable failures

Broken input returns a reason, not a blank screen.

FAQ

Is my input uploaded?
No. Conversion runs in this browser. Pasted timestamps and datetimes are not sent.
How do you tell seconds from milliseconds?
Auto mode uses magnitude (about 10 digits for seconds, 13 for milliseconds). You can lock the unit in Advanced options.
How is a datetime without a zone handled?
Values without Z or an offset are read as wall time in the selected time zone.
Are microseconds and nanoseconds exact?
JavaScript time is millisecond precision. Finer units are rounded to milliseconds.

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