Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Supports seconds, milliseconds, and your local timezone.
What is a Unix Timestamp?
A Unix timestamp (also called Epoch time) is the number of seconds that have elapsed since 1970-01-01 00:00:00 UTC. It's used universally in programming, databases, and APIs to represent moments in time without timezone ambiguity.
Seconds vs milliseconds — which should I use?
Unix timestamps are traditionally in seconds. However, JavaScript's Date.now() and many modern APIs return milliseconds (13-digit numbers). If your timestamp has 13 digits, it's likely milliseconds; 10 digits means seconds.
What timezone does this converter use?
The UTC output is always timezone-neutral. The "Local" output uses your browser's system timezone automatically. You can see both side by side in the results.
What is the Unix epoch?
The Unix epoch is the reference point: January 1, 1970 at 00:00:00 UTC. All Unix timestamps count seconds (or milliseconds) from this moment. It was chosen when Unix was designed in the late 1960s.
What is the Year 2038 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 don't have this limitation and can handle dates billions of years into the future.