Method
Choose seconds, milliseconds, or an ISO date input and the converter returns the same instant in each supported format.
Utilities / browser tool
Timestamp Converter
All output is in UTC — no local-timezone ambiguity.
Your inputs stay on your device
Convert a timestamp
live resultUnix seconds
Unix milliseconds
ISO 8601
Readable UTC date/time
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.
Useful context
How it works
Use the calculator first, then scan the details below when you want more context about the inputs, result, or assumptions.
How to use it
Choose an input mode, enter the timestamp or ISO value, and copy the labelled UTC outputs.
Understand the result
Seconds and milliseconds differ by a factor of 1000; readable and ISO results are UTC representations.
Example
Unix seconds 0 becomes 1970-01-01T00:00:00.000Z and 01 Jan 1970, 00:00:00 UTC.
Notes
Unix timestamps identify a point in time. Readable dates and ISO output are always shown in UTC.
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