Free Online Unix Timestamp Converter & Epoch Calculator
Convert Unix timestamps to readable dates in multiple formats. Shows the current timestamp live and calculates dates to Unix. No sign-up.
Current Unix timestamp
—
Unix → Human date
Enter a Unix timestamp to convert it…
Date → Unix
Invalid date
Quick references
Built by
Miguel Ángel Colorado Marin
Built by
Miguel Ángel Colorado Marin
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to use the timestamp converter?
- 1
Check the current timestamp
The top section shows the current Unix timestamp updating every second in real time. You can copy it directly in seconds or milliseconds, or click 'Use in converter' to automatically send it to the Unix → Date conversion panel.
- 2
Convert Unix to readable date
Enter any Unix timestamp in the left panel. The tool automatically detects whether it's in seconds (fewer than 13 digits) or milliseconds (13 digits or more). You'll see the result in ISO 8601, UTC, local date and relative time formats.
- 3
Convert date to Unix
In the right panel, select a date using the date picker and a time using the time picker. The Unix timestamp in seconds and milliseconds is calculated instantly.
- 4
Use the quick references
The references section at the bottom lets you load well-known timestamps (start of 2024, start of 2025, 32-bit Unix max…) to understand the time scale of Unix timestamps or make quick comparisons.
Frequently asked questions
What is a Unix timestamp?
A Unix timestamp (also called Unix time or epoch time) is the number of seconds elapsed since 00:00:00 UTC on 1 January 1970. It is the most widely used time system in computing because it is a simple integer, independent of time zones, that allows date comparison by direct subtraction.
What is the difference between seconds and milliseconds?
Timestamps in classic Unix systems, databases and REST APIs are usually in seconds (10 digits in 2024: 1700000000). JavaScript and many modern APIs use milliseconds (13 digits: 1700000000000). The tool automatically detects the format based on the magnitude of the number.
What is the Year 2038 problem?
Systems that store Unix timestamps in a signed 32-bit integer have a maximum value of 2,147,483,647 (19 January 2038 at 03:14:07 UTC). Past that point, the counter overflows and wraps to a negative value, causing errors. Modern systems use 64-bit integers that will not have this problem until the year 292,277,026,596.
Why is the date shown in the wrong time zone?
The Unix timestamp is always UTC. When you convert it to local date, the browser automatically applies the time zone configured in your operating system. If you need a specific time zone different from yours, use the ISO 8601 or UTC format which always shows the time in UTC.
Is my data sent to any server?
No. All timestamp conversion is done using JavaScript's native Date object in your browser. No timestamp or date is sent to any external server.
Embed the converter on your site
Embed this timestamp converter in any web page with a simple iframe:
<iframe
src="https://miguelacm.es/embed/timestamp-converter"
width="100%"
height="600"
frameborder="0"
title="Timestamp Converter"
></iframe>