Unix Timestamp Converter

Convert Unix/POSIX epoch values locally with explicit or auto-detected precision, exact BigInt unit conversions, ISO/RFC output, local time, and reverse date-to-timestamp conversion.

Unix timestamp

Input unit

Detected / selected

——

—Seconds

—Milliseconds

—Microseconds

—Nanoseconds

——
—

Date and time

Interpret as

Output unit

——

Unix/POSIX time is based on seconds since the 1970-01-01 UTC epoch. Browser date rendering uses JavaScript Date/Intl; sub-millisecond epoch arithmetic is preserved with BigInt where the tool exposes it.

One instant, four epoch units

Auto-detection is labeled as a heuristic and can always be overridden. UTC is the storage/reference basis; local time is only a display of the same instant.

Built for developer copy-and-check workflows

v264 keeps current-time shortcuts, copy actions, practical mobile controls and the governing unit/zone assumption next to the result so common log and API timestamp checks take fewer steps.