Unix Timestamp Converter — Free Online Tool

The Unix Timestamp Converter translates between epoch timestamps and human-readable dates in both directions. A Unix timestamp counts seconds since 1 January 1970 UTC, which is how essentially every database, log file, API response, and JWT expiry field stores a moment in time — a single integer with no timezone or formatting ambiguity attached.

The first thing to check when a converted date lands decades away from where you expected is the unit. JavaScript's Date.now() returns milliseconds; most other systems return seconds. Feeding a millisecond value into a seconds-based converter puts you somewhere around the year 56,000, and feeding seconds into a millisecond parser puts you in January 1970 — both errors are instantly recognisable once you know to look for them.

The second is the timezone. The timestamp itself is always UTC, but the readable date you are comparing against is usually in local time, so a value that looks five hours off is very often correct and simply being displayed in a different zone. Showing both UTC and local time side by side is the fastest way to confirm which one you are actually looking at.

The other well-known consideration is the 2038 problem: a signed 32-bit timestamp overflows on 19 January 2038, which still affects some embedded and legacy systems even though modern platforms use 64-bit values.

Conversion happens instantly in your browser.

Our Unix Timestamp Converter is completely free to use with no signup required. For this tool, processing runs in your browser — your files and data stay on your device and are not uploaded to our servers.

Whether you are a developer, designer, student, or business owner, this tool is designed to save you time and make your workflow more efficient. Bookmark this page to access it whenever you need it — it will always be free.