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Convert Unix epoch timestamps to human-readable dates and back, in seconds or milliseconds, with local, UTC, and ISO 8601 output. Browser-based, no uploads.
Unix timestamps are the universal language of time in software systems — but reading one as a human requires a converter. The Unix Timestamp Converter translates between epoch seconds, milliseconds, and human-readable datetime in both directions.
exp and iat claims to readable dates.The number of seconds (or milliseconds) elapsed since January 1, 1970 00:00:00 UTC — used universally in systems programming.
JavaScript uses milliseconds. Divide by 1000 to convert to POSIX seconds for APIs that use second-precision timestamps.
32-bit signed integers overflow in January 2038 (Y2K38 problem). Modern systems use 64-bit integers which are safe for billions of years.
Check out our technical guides to learn more about how browser-side processing works.
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