Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates. Supports seconds, milliseconds, and auto-detection. Everything runs in your browser — nothing is sent to a server.

What is a Unix Timestamp?

A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 00:00:00 UTC (the “epoch”). It is timezone-independent, making it the standard way to represent time in APIs, databases, and log files.

Quick Reference

• Current time — The converter shows the current Unix timestamp in real time.
• Seconds vs milliseconds — Some systems (e.g., JavaScript’s Date.now()) use milliseconds. This tool auto-detects based on the number of digits.
• Year 2038 problem — 32-bit systems storing timestamps as signed integers will overflow on January 19, 2038. Most modern systems use 64-bit integers.

Common Use Cases

• Converting log timestamps to human-readable dates for debugging.
• Setting exp and iat claims in JWT tokens.
• Comparing timestamps across systems in different timezones.