Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds, with timezone display.

Current Unix Timestamp: —

Timestamp → Date

Enter a Unix timestamp above

Date → Timestamp

Select a date above

What Is a Unix Timestamp?

A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC. It's a universal way to represent time in computing — every programming language and operating system understands Unix timestamps, making them ideal for storing and transmitting time data.

Seconds vs Milliseconds

Unix timestamps are traditionally in seconds (10 digits, e.g., 1700000000). However, JavaScript and many modern APIs use milliseconds (13 digits, e.g., 1700000000000). This converter automatically detects which format you're using based on the length of the number.

Common Uses

Timestamps are used in database records, API responses, log files, authentication tokens (JWT), caching headers, and anywhere precise time tracking is needed. They're timezone-independent — the same timestamp represents the same moment in time everywhere in the world.