Timestamp Converter
/timestamp-converterConvert Unix timestamps to readable dates and back. Works with seconds, milliseconds, and ISO date strings.
Unix timestamps appear in logs, APIs, and databases, but nobody can read 1722643200 as a date at a glance. This converter translates between seconds, milliseconds, and ISO date strings in both directions. It resolves timezone ambiguity by showing your local time and UTC together. Conversion is instant and entirely client-side.
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FAQ
Frequently asked questions
Everything you need to know about timestamp converter.
How do I know if my timestamp is in seconds or milliseconds?
The tool auto-detects: numeric values with 12 or more digits are treated as milliseconds, and shorter values as seconds. Plain date strings are parsed as dates.
Can I convert a date to a timestamp?
Yes. Paste any parseable date string such as 2024-01-01, and the tool returns Unix seconds, Unix milliseconds, ISO 8601, local, and UTC representations.
Why did I get an Invalid timestamp error?
The value was neither a valid number nor a string the Date constructor could parse. Check for stray characters or wrong separators.
What does the Now button do?
It fills the input with the current Unix time in seconds, so converting the present moment is a single click.
Why does the output show several formats?
Different languages and APIs expect different formats. Showing ISO 8601, local, UTC, seconds, and milliseconds removes the guesswork.
Is the conversion done locally?
Yes, entirely in your browser with the standard Date API. Nothing is sent to a server, so timestamps stay private.
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