What is a Unix timestamp?

A Unix timestamp (epoch time) is the number of seconds that have elapsed since January 1, 1970 (UTC). It's widely used in programming to represent time.

What is the difference between seconds and milliseconds timestamps?

Unix timestamps in seconds are 10 digits (e.g., 1700000000), while millisecond timestamps are 13 digits (e.g., 1700000000000). JavaScript uses milliseconds, while most other systems use seconds.

Why do programmers use Unix timestamps?

Unix timestamps are timezone-independent, easy to compare and calculate differences, compact to store, and universally supported across programming languages.

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Timestamp Converter

Convert between Unix timestamps and human-readable dates

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Unix Timestamp (seconds)

converts to / from

Date & Time (local)

How It Works

Enter Value

Enter a Unix timestamp or select a date

Convert

The tool converts between formats instantly

Copy Result

Copy the converted value to your clipboard

Frequently Asked Questions

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Last updated: Feb 27, 2026