Timestamp Converter
Convert Unix timestamps to readable dates and convert dates back to Unix time. Supports seconds, milliseconds, local time, UTC and ISO 8601.
Convert timestamp
Switch between Unix timestamp input and local date/time input.
Enter a timestamp or local date/time to convert.
Quick timestamp examples
What is a Unix timestamp?
A Unix timestamp is a count of time from 1970-01-01 00:00:00 UTC. It is commonly used in APIs, logs, databases and developer tools because it stores a single moment in time as a number.
Seconds vs milliseconds
Many systems store Unix time in seconds, while JavaScript dates use milliseconds. A seconds timestamp often has 10 digits for modern dates, while a millisecond timestamp often has 13 digits.
Local time vs UTC
Local time is shown using your browser timezone. UTC is a standard global time reference. The same timestamp can display as different local times in different timezones.
ISO 8601 date format
ISO 8601 is a standard date/time format used by many APIs and databases. A value ending in Z, such as 2026-06-24T12:30:00.000Z, is expressed in UTC.
Common timestamp conversion mistakes
Mixing up seconds and milliseconds
A millisecond timestamp is 1000 times larger than a seconds timestamp. If the date looks far in the future or near 1970, check the unit.
Forgetting timezone differences
Local time depends on your browser timezone. UTC output is labeled separately so you can compare both representations of the same moment.
Copying timestamps with extra digits
Extra digits can change the result or make the timestamp invalid. Trim spaces and check whether the number should be seconds or milliseconds.
Confusing ISO strings with local display time
ISO strings that end with Z are UTC values. Your local display can be earlier or later depending on your timezone.
Free online timestamp converter
This timestamp converter helps you move between Unix time and readable dates without installing anything. You can paste a seconds or milliseconds timestamp, convert it to local time, UTC and ISO 8601, or choose a local date/time and convert it back to Unix timestamp values.
Timestamp conversion is useful when checking API responses, debugging logs, comparing database values, scheduling events or translating machine-readable times into something easier to understand. The converter uses your browser's local timezone for local output and labels UTC output separately.
Browser-based timestamp conversion
All calculations run locally in your browser. Your timestamps and date values are not uploaded or stored. The converter also shows the current Unix timestamp so you can quickly copy the current time in seconds or milliseconds.
Timestamp Converter FAQ
What is a Unix timestamp?
A Unix timestamp is a number that counts time from January 1, 1970 at 00:00:00 UTC.
Is Unix timestamp in seconds or milliseconds?
Unix timestamps are commonly stored in seconds, while many JavaScript and API values use milliseconds. This converter supports both.
How do I convert a timestamp to a date?
Choose timestamp to date, enter a seconds or milliseconds timestamp, then convert to see local time, UTC time and ISO 8601.
What is the difference between local time and UTC?
Local time uses your browser timezone. UTC is a global time standard that does not shift with your local timezone.
What is ISO 8601?
ISO 8601 is a standard date and time format often used by APIs, logs and databases, such as 2026-06-24T12:30:00.000Z.
Is my timestamp stored?
No. Timestamp conversion runs locally in your browser and your values are not uploaded or stored.
Is this converter free?
Yes. The timestamp converter is free to use and works directly in your browser.