Unix timestamps (epoch time) count seconds since January 1, 1970 00:00:00 UTC. They're everywhere in software — database records, API responses, log files, JWT tokens, and cron schedules. This epoch converter translates between timestamps and human-readable dates instantly, running entirely in your browser.

The tool auto-detects whether your input is in seconds (10 digits, e.g., 1700000000) or milliseconds (13 digits, e.g., 1700000000000). JavaScript's Date.now() returns milliseconds, while most Unix systems and databases use seconds — this converter handles both without you having to think about it.

You can also convert in the other direction: paste a date string like 2024-01-01T00:00:00Z or Jan 1 2024 and get the corresponding Unix timestamp. This is useful when writing database queries with date filters, setting expiration times for tokens, or debugging time-related bugs.

Tips

JavaScript uses milliseconds (Date.now()), but most APIs and databases use seconds. Divide by 1000 when converting.
The 32-bit Unix timestamp overflows on January 19, 2038. If you're storing timestamps as 32-bit integers, you'll hit this limit.
UTC is the standard for timestamps. Always store and transmit times in UTC, then convert to local time for display.
Use date +%s in a terminal to get the current Unix timestamp on macOS or Linux.