Unix Timestamp Batch
Convert a list of Unix timestamps in seconds or milliseconds into ISO dates.
How to use the Unix Timestamp Batch
What does the Unix Timestamp Batch do?
Convert a list of Unix timestamps in seconds or milliseconds into ISO dates; It applies this page-specific rule: traditional Unix time counts seconds since January 1, 1970 UTC.
Which inputs does this tool use?
To convert a list of unix timestamps in seconds or milliseconds into iso dates, enter Unix timestamps, one per line, Input unit, Output time zone, Converted dates and times; keep every value in the same example; where available, choose between Detect seconds or milliseconds, Seconds, Milliseconds, UTC ISO 8601, This device’s local time to match the required format; select Convert Unix timestamps when the values are ready; Start with a familiar case covered by this rule - Automatic mode treats magnitudes of 100 billion or more as milliseconds - so the expected result can confirm the settings.
How should the tool result be read?
For a result intended to convert a list of unix timestamps in seconds or milliseconds into iso dates, automatic mode treats magnitudes of 100 billion or more as milliseconds; read converted dates and times together with the original unix timestamps, one per line rather than as an isolated answer, and confirm that its units or structure match the intended use.
Why are some timestamps 10 digits and others 13?
When the goal is to convert a list of unix timestamps in seconds or milliseconds into iso dates, current Unix seconds are usually 10 digits; milliseconds are usually 13.
Are negative timestamps supported?
When using the page to convert a list of unix timestamps in seconds or milliseconds into iso dates, yes.
Limits and accuracy
When using this tool to convert a list of unix timestamps in seconds or milliseconds into iso dates, UTC ISO output is stable across devices; check the result in its intended destination before relying on it for important work; keep unix timestamps, one per line until the output has been checked in its intended destination.
Seconds versus milliseconds
Traditional Unix time counts seconds since January 1, 1970 UTC. Browser and JavaScript timestamps commonly use milliseconds, producing values about one thousand times larger.
Automatic mode treats magnitudes of 100 billion or more as milliseconds. Choose a unit explicitly for historic, far-future, or unusual values where magnitude detection could be misleading.
UTC ISO output is stable across devices. Local output depends on the visitor’s operating-system time zone.
Frequently asked questions
Why are some timestamps 10 digits and others 13?
Current Unix seconds are usually 10 digits; milliseconds are usually 13.
Are negative timestamps supported?
Yes. They represent dates before the Unix epoch when the browser supports that range.
Why choose UTC output?
UTC provides an unambiguous value that does not change with the viewer’s location.