Developer tools
Unix Timestamp Converter

Unix timestamp converter

Paste an epoch timestamp from a log, database or JWT and see it as a readable date in UTC and your local time — or turn a date back into a timestamp. CodeForge works out whether the number is in seconds or milliseconds for you.

Open Unix Timestamp Converter — free Get the Windows app

Free in your browser — no sign-up. Install from the Microsoft Store to use it offline on Windows 10 and 11.

How to use it

Open the Timestamp tool and paste a Unix timestamp, or press Now for the current time.
See the date in UTC, local time, ISO 8601 and as a relative time (“3 hours ago”).
To go the other way, enter a date and time and convert it to a timestamp.

Example

Timestamp

1700000000      (seconds)
1700000000000   (milliseconds)

Date

ISO 8601 (UTC)  2023-11-14T22:13:20.000Z
Both inputs are the same moment.

Features

Seconds or milliseconds, detected automatically.
UTC, local time, ISO 8601 and relative time side by side.
Date to timestamp conversion.
Batch conversion — convert many timestamps at once and download a CSV. PRO

Frequently asked questions

What is a Unix timestamp?

The number of seconds since 00:00:00 UTC on 1 January 1970 (the Unix epoch). JavaScript and many APIs use milliseconds instead, which is why some timestamps have 13 digits.

How do I tell seconds from milliseconds?

Present-day timestamps have 10 digits in seconds and 13 in milliseconds. CodeForge detects this for you.

What happens in 2038?

Systems that store Unix time as a signed 32-bit integer overflow on 19 January 2038. Modern 64-bit systems are not affected.

One workspace for all of it

Unix Timestamp Converter is one of 18 developer tools in CodeForge — alongside a JSON formatter, JWT decoder, regex tester, UUID and hash generators, and more. Press Ctrl+K to jump to any of them.