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Timestamp Generator & Converter

Convert Unix seconds/milliseconds and offset-aware ISO dates. Configure options and generate. Results stay only in this page.

local means the browser’s time zone. Unix seconds accept up to 3 decimal places; milliseconds must be integers. Output timestamps are strings to preserve precision in downstream JSON. Zone-free dates and leap seconds are rejected.

All computation runs in a local Worker. Inputs/results are never uploaded, logged, placed in URLs or saved automatically. Changing parameters clears old results; leaving clears results. Manage exported files and clipboard content yourself. Maximum output: 2 MiB.

How to use & limits

Select seconds or milliseconds explicitly. ISO input must include Z or an offset, for example 2026-10-26T08:00:00+08:00. Display zones do not change the underlying instant. Invalid dates and ambiguous zone-free dates are rejected.