Unix Timestamp Converter
Convert Unix (epoch) timestamps to human-readable dates and back — in UTC and your local time zone. Two-way, live and entirely client-side.
Runs locally · nothing uploadedAbout Unix timestamps
A Unix timestamp counts the seconds elapsed since the Unix epoch — 1970-01-01T00:00:00Z — ignoring leap seconds. Because it's a single integer measured in UTC, it's the standard way to represent an instant in databases, log files, JWTs and HTTP headers, free of time-zone ambiguity.
This converter works both ways. Paste a timestamp to see the exact instant rendered in UTC and in your browser's local time zone, or pick a local date and time to get the corresponding epoch value in seconds and milliseconds. Everything is computed with the browser's native Date and Intl APIs, so it's instant and completely private. Use the seconds/milliseconds toggle to match your source: 10-digit values are seconds, 13-digit values (like JavaScript's Date.now()) are milliseconds.
Frequently asked questions
What is a Unix timestamp?
1970-01-01T00:00:00Z (the Unix epoch), not counting leap seconds. It's the most common way to store a point in time in databases, logs and APIs because it's timezone-independent and easy to compare.Seconds or milliseconds — which one do I have?
1752307200); millisecond timestamps (used by JavaScript's Date.now()) are 13 digits (e.g. 1752307200000). Pick the matching unit with the toggle — the converter multiplies or divides by 1000 accordingly.Which time zone is the local time based on?
Does any of this data leave my browser?
Date and Intl APIs. Nothing is uploaded, logged or stored.