Timestamp Converter

Convert Unix timestamps to readable dates, and vice versa.

All output is in UTC — no local-timezone ambiguity.

Your inputs stay on your device

Convert a timestamp

live result

Input type

Unix seconds

1700000000

Unix milliseconds

1,700,000,000,000

ISO 8601

2023-11-14T22:13:20.000Z

Readable UTC date/time

14 Nov 2023, 22:13:20 UTC

Unix timestamps represent a point in time. All output is formatted in UTC. Plain dates (YYYY-MM-DD) in Date mode are treated as UTC midnight.

Context & Reference

Calculators are most useful when their assumptions are clear. Review these details to better understand the logic behind the results.

Choose seconds, milliseconds, or an ISO date input and the converter returns the same instant in each supported format.

Choose an input mode, enter the timestamp or ISO value, and copy the labelled UTC outputs.

Seconds and milliseconds differ by a factor of 1000; readable and ISO results are UTC representations.

Unix seconds 0 becomes 1970-01-01T00:00:00.000Z and 01 Jan 1970, 00:00:00 UTC.

Unix timestamps identify a point in time. Readable dates and ISO output are always shown in UTC.

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