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Timestamp Converter
Convert Unix timestamps to and from human-readable dates.
timestamp-converter.tool
Seconds or milliseconds - auto-detected.
Changing this updates the timestamp too.
Loading current time…
Nothing you enter here is ever sent to a server - conversion happens locally in your browser.
What is a timestamp converter?
This tool converts between Unix timestamps and human-readable dates in both directions. It auto-detects whether a timestamp is in seconds or milliseconds, and shows the result in multiple formats at once - ISO 8601, UTC, local time, and relative ("3 hours ago").
How to use this tool
- 1Type a Unix timestamp, or click Now to grab the current one.
- 2The date/time field updates instantly - or edit the date/time field directly to update the timestamp instead.
- 3Every common format (ISO 8601, UTC, local, seconds, milliseconds, relative) is shown at once, each with its own Copy button.
Common use cases
Decoding a Unix timestamp found in an API response or database row
Converting a specific date and time into a timestamp for a script or query
Checking exactly how long ago a timestamp represents
Debugging timezone issues by comparing UTC and local time side by side
Good to know
Frequently asked questions
How does it know if my timestamp is in seconds or milliseconds?
By digit count - Unix timestamps in seconds are 10 digits for dates in this era, while millisecond timestamps are 13 digits. The tool detects which one you've entered and converts accordingly.
What timezone is the 'Local' format in?
Your browser's own timezone setting - the same one your operating system uses. UTC is shown separately for an unambiguous reference point.
Can I convert a specific future or past date into a timestamp?
Yes - use the date/time field on the right. Whatever you set there instantly updates the Unix timestamp on the left.
Is my input sent anywhere?
No - all conversion happens locally in your browser.
quick_facts.json
{
"runs_in_browser": true,
"data_sent_to_server": false,
"signup_required": false,
"price": "free",
"category": "Converters"
}