Unix timestamp converter
Convert explicit epoch seconds or milliseconds to UTC and a chosen time zone.
Your inputs
The editable example is illustrative. Enter your own dimensions, operating data, prices, and fees. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
Your result
Complete the inputs to see your result.
How it works
- Epoch milliseconds = 1000 × Epoch seconds; 1970-01-01T00:00:00.000Z = 0
- Worked example: 0 s ⇒ 1970-01-01T00:00:00.000Z; −1 s ⇒ 1969-12-31T23:59:59.000Z
- Supported input limits: Integer timestamp: n ≤ 18
Assumptions and limitations
Civil dates use years 1–9999. Regional instant rules use the browser’s IANA database and support 1900–9999. Select earlier or later for repeated local times; nonexistent times are rejected. Clock differences and elapsed time are distinct. No national holidays, payroll law or legal deadlines are inferred. Timestamp input supports integer milliseconds within ±8640000000000000. Seconds and milliseconds are explicit; no leap-second accounting. Date entry uses the civil range and regional zone limits stated above.
Sources
- MDN — Intl date/time and time-zone formatting Sources reviewed: 2026-10-06
