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.
How it works
- = 1,000 × ; 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: : n ≤ 18
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
Select seconds or milliseconds explicitly; integer input represents time from 1970-01-01 UTC without leap seconds. The millisecond range is ±8,640,000,000,000,000. Date entry supports years 1–9999, with regional zones from 1900.
Sources
- MDN — Intl date/time and time-zone formatting Sources reviewed: 2026-10-06
