Unix Timestamp Converter - Epoch Seconds, Milliseconds, UTC and ISO 8601
Convert Unix epoch seconds or milliseconds to local time, UTC time, ISO 8601, and back from local date-time to copyable seconds or milliseconds.
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What this tool is for
Paste a 10-digit seconds timestamp, a 13-digit milliseconds timestamp, or a local date-time, then copy Unix seconds, Unix milliseconds, ISO 8601, UTC time, or the full conversion result from the first screen.
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Timestamp Converter is part of a wider browser toolbox. These links help users and crawlers move from this page into nearby daily tasks.
Frequently asked questions
Is Timestamp Converter free?
Yes. ToolNest provides Timestamp Converter as a free browser-based utility.
Does Timestamp Converter require an account?
No account is required. Open the tool and use it directly in your browser.
Should I use seconds or milliseconds in Timestamp Converter?
Unix timestamps are often stored as seconds, while JavaScript Date values and many APIs use milliseconds. If a 10-digit value looks like a modern date, use seconds; if a 13-digit value looks like a modern date, use milliseconds.
Why does Timestamp Converter show local time, UTC time, and ISO 8601?
The same timestamp represents one instant, but it can be displayed in your local time zone, UTC, or ISO 8601 format. Showing all three helps debug logs, databases, APIs, and scheduled jobs across time zones.
Can Timestamp Converter convert local date and time back to a Unix timestamp?
Yes. Enter a local date and time, choose seconds or milliseconds as the output unit, then copy the matching Unix timestamp directly from the first screen.
How do I use Timestamp Converter?
Open the Timestamp Converter page, enter or paste your values, use the visible controls, and copy the result from the first working area. It is grouped with Date & Time for quick browsing.
Can I copy results from Timestamp Converter?
Yes. ToolNest tools are designed around copy-ready output, so you can reuse the result in documents, spreadsheets, code editors, forms, or messages without creating an account.