Unix Timestamp Converter

What is Unix Timestamp Converter?

A Unix timestamp converter that translates between epoch timestamps and human-readable dates in both directions. It detects automatically whether a value is 10 digits (seconds) or 13 digits (milliseconds) and shows the result in both your local time zone and UTC. Every conversion runs in the browser, so the tool works offline.

How to use Unix Timestamp Converter

1. 1Paste a timestamp — the tool infers the unit from the number of digits.
2. 2Or type a date string to convert in the opposite direction and get the timestamp.
3. 3Compare the local-time and UTC columns side by side to rule out a time zone misreading.
4. 4Hit "Now" to grab the current timestamp instantly.

How do I do this in code?

Use the tool above for one-off work; for anything you repeat, move it into a script or your project.

// Current timestamp in milliseconds
Date.now();

// Seconds → Date
new Date(1767225600 * 1000).toISOString();

// Date → seconds
Math.floor(new Date('2026-01-01T00:00:00Z').getTime() / 1000);

Common errors and how to fix them

Frequently asked questions