Unix Timestamp Converter

A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since January 1, 1970 00:00:00 UTC, also known as the Unix epoch. It is a standard way to represent dates and times in programming, databases, and APIs.

Unix timestamps in seconds count whole seconds since the epoch (e.g. 1723412345). Millisecond timestamps multiply that value by 1,000 (e.g. 1723412345000). JavaScript's Date.now() returns milliseconds, while many Unix systems and APIs use seconds. A 10-digit value is usually seconds; 13 digits usually means milliseconds.

Enter your timestamp in the input field and select whether it is in seconds or milliseconds. The tool instantly converts it to ISO 8601, RFC 2822, local time, UTC, and a relative format like '2 hours ago'. All conversions run in your browser with no server upload.

Use the date-to-timestamp section and pick a date and time with the datetime picker, or paste an ISO 8601 string. The tool outputs both the seconds and milliseconds values, ready to copy into your code, API calls, or database queries.

Unix timestamps are timezone-independent, compact, and easy to sort and compare. They appear in JWT tokens, log files, database records, webhook payloads, and AI API responses. Converting between timestamps and readable dates is a daily task in backend and frontend development.

Yes. This tool is completely free with no limits, no signup, and no account required. All conversion happens locally in your browser, so your data never leaves your device.