How to use it
- 1
Enter Unix seconds or a date value.
- 2
Choose the conversion direction.
- 3
Copy the ISO string or integer number of seconds.
What the tool can do
- Unix timestamps in seconds.
- UTC date output through toISOString.
- Parsing of valid date values supported by the browser.
Common use cases
- Reading a timestamp from an API or log.
- Preparing Unix seconds for a test.
- Checking the UTC instant of an event.
How it works inside
The Unix epoch starts on January 1, 1970 UTC.
When converting a date, fractional seconds are floored to an integer Unix timestamp.
Questions and answers
Should the timestamp use seconds?
Yes. The current version expects seconds, not milliseconds.
Can I select a timezone?
No. ISO output is displayed in UTC.