HTMLUnix Timestamp Converter
Convert Unix timestamps to human-readable dates and back. Auto-detects seconds vs milliseconds. Shows ISO 8601, UTC, local time, and relative time ("3 hours ago"). Includes a "Now" button to get the current timestamp instantly.
Ctrl+Enter to run | Ctrl+K to switch tools | Recent button shows input history
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What is a Unix timestamp?
A Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC. It's timezone-agnostic and universally supported across programming languages and databases.
Seconds vs milliseconds — how do I tell?
Timestamps in seconds are typically 10 digits (e.g. 1716239022). Millisecond timestamps are 13 digits. This tool auto-detects which you've entered and labels the output accordingly.