Days between dates, add & subtract.
Length, weight & temperature.
Percentages, ratios & change.
Built with privacy in mind. All processing happens entirely in your browser using open-source libraries.
Unix timestamps count seconds since January 1, 1970 (UTC) — great for machines, terrible for humans. This converter turns any timestamp into local time, UTC, ISO 8601 and relative text, and converts a chosen date back into its Unix value.
Debugging logs, API payloads and database fields constantly mix epochs and dates. Because the conversion is done locally, none of your data leaves the browser, and the Now button gives you an instant baseline for the current moment.
Yes, free with no signup or limits.
Your local timezone, plus UTC and ISO 8601 for reference.
The output shows millisecond precision, and values in milliseconds are detected automatically.