Unix timestamp converter
Convert Unix timestamps to UTC dates and back, in seconds or milliseconds.
Choose a direction and unit. Enter dates as complete ISO 8601 UTC values, such as 2026-01-01T00:00:00Z.
Result
Enter your data and run the tool. Your result will appear here.
Data is processed only on this page and is not sent to the server. Reloading or navigating away clears it.
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Method, examples and limits
Unix timestamps measure time since January 1, 1970 at 00:00:00 UTC. Zero corresponds to that instant; 1000 milliseconds equals 1 second. Negative values represent earlier dates. Conversion to seconds floors fractional values. Leap seconds are not represented and the local time zone is not applied.
Frequently asked questions
Does the result use my local time zone?
No. Dates are UTC and end in Z; explicitly choose seconds or milliseconds.
Is this data saved?
Data is processed only on this page and is not sent to the server. Reloading or navigating away clears it.