← All tools

Timestamp Converter

Convert Unix timestamps to human-readable dates, or pick a date and get its Unix timestamp. Both UTC and local time are shown automatically.

All processing is client-side — no data leaves your browser.
Timestamp → Date 
Result will appear here...
Date → Timestamp 
Result will appear here...

About Unix timestamps

What is a Unix timestamp?

A Unix timestamp is the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 — known as the Unix epoch. It is a single integer with no time zone, which makes it the standard way to store and compare moments in time across systems.

Seconds vs milliseconds

Most Unix APIs return timestamps in seconds (10 digits, e.g. 1716470400). JavaScript's Date.now() returns milliseconds (13 digits). This tool detects which you've entered and handles both automatically.

Time zones

A Unix timestamp is always UTC. The "Local" row shown in results uses your browser's detected time zone. The ISO 8601 output includes a Z suffix to confirm it is UTC. Use UTC strings when storing dates in databases to avoid offset bugs.

The Y2K38 problem

Systems that store Unix time as a signed 32-bit integer will overflow on 19 January 2038 at 03:14:07 UTC. Modern 64-bit systems are not affected. If you're maintaining legacy C code or embedded firmware, this is worth checking.

How to use

  1. 1
    Enter a timestamp or date

    Paste a Unix timestamp (e.g., 1748131200) or type a date in the date field.

  2. 2
    Convert

    The tool shows the equivalent date and time in both UTC and your local timezone.

  3. 3
    Use the current time shortcut

    Click "Now" to instantly load the current Unix timestamp.

Frequently asked questions

What is a Unix timestamp?

A Unix timestamp is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC (the "Unix epoch"). It is the most universal way to represent a specific moment in time in software, independent of timezone or locale.

Does this tool show local timezone?

Yes. The converted date is displayed in both UTC and your browser's local timezone, so you can immediately see the time in your region without doing timezone math manually.

What is the Y2K38 problem?

32-bit systems store Unix timestamps as signed integers, which overflow on January 19, 2038 at 03:14:07 UTC. Modern 64-bit systems extend this far beyond the practical future. This tool uses JavaScript's 64-bit numbers and does not suffer from this limitation.

Can I convert a date back to a Unix timestamp?

Yes. The tool works in both directions — enter a date and time to get the Unix timestamp, or enter a timestamp to get the human-readable date.