Unix Nanoseconds Converter

Convert Unix timestamps with nanosecond precision

JavaScript Date uses millisecond precision, but distributed systems, Prometheus metrics, and some databases store nanoseconds since epoch. Multiplying huge integers as floats loses digits past ~15 significant figures. This converter uses BigInt arithmetic so values like 1729256400000000000 round-trip without drift.

Three ways to enter time

Paste a nanosecond counter, pick a local datetime, or type an ISO-8601 string. All inputs stay synchronized: editing nanoseconds updates the decoded UTC ISO string and local timezone text.

For second-level epochs, the Epoch Unix Timestamp Converter may be simpler. For log formatting, combine with the strftime Playground.