Unix Timestamp Converter
Convert Unix timestamps to dates and ISO dates back, with relatives.
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Runs entirely in your browser. Your input never leaves this device and is never stored.
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Input
Unix seconds, Unix milliseconds (auto-detected), or ISO 8601.
Result
No input yet.
Enter a Unix timestamp or ISO 8601 date.
Timestamp Converter turns a Unix timestamp into a calendar date, an ISO string and a relative label, and goes the other way when you paste a date and need seconds for an API parameter. It detects whether a numeric value is in seconds or milliseconds automatically, using a documented threshold rather than a guess, and the page states that threshold so an ambiguous magnitude can be checked by hand. Relative labels use average month and year lengths rather than calendar arithmetic, which is accurate enough for reading and is stated rather than hidden. Local rendering follows your own time zone, so a screenshot shared with a colleague in another region will not show the same wall clock - the page says so, because that difference is a common source of confusion during an incident. It is the tool for decoding an epoch value from a log, converting a date for a request, or checking what a user in your time zone would actually see. Nothing is uploaded. Both directions accept the same paste box, so a value can be converted, copied back, and converted again to confirm that nothing was lost in the round trip. Magnitude decides whether a number is read as seconds or milliseconds, and ambiguous values follow the documented heuristic rather than a guess made silently.
How to use Unix Timestamp Converter
- Paste seconds, milliseconds, or an ISO date.
- Read the converted forms instantly.
- Copy the summary or clear to start over.
What you get
- The same instant as a calendar date, an ISO string, and a relative label.
- Automatic detection between seconds and milliseconds, using the documented threshold rather than a guess.
- Local rendering in the viewer's own time zone, stated so a shared screenshot is not mistaken for UTC.
When to use Unix Timestamp Converter
- Decode an epoch value from logs into a calendar date.
- Turn an ISO date into seconds for API parameters.
- Translate an expiry value from an API response into the local time a user would actually see.
Frequently asked questions about Unix Timestamp Converter
Does Timestamp Converter upload my input?
No. Conversion runs locally in your browser; nothing is sent, stored, or logged.
How does it tell seconds from milliseconds?
Values above 1e11 are read as milliseconds, smaller ones as seconds. ISO strings are detected by parsing.
Why does local time differ from UTC?
Local output follows the viewer's time zone while ISO output stays in UTC. Both describe the same instant.
How exact are relative labels?
They use average month and year lengths, so “1 month ago” is approximate by design.
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