How to use Unix Timestamp Converter
Unix timestamps represent an instant as seconds or milliseconds from the Unix epoch. XXF detects common numeric lengths and reports ISO 8601, UTC, local time and both epoch units together.
The side-by-side output helps reveal the classic thousand-fold seconds-versus-milliseconds error and separates an absolute instant from the timezone used to display it.
A reliable workflow
- Paste Unix seconds, Unix milliseconds or a parseable date string
- Convert and compare ISO, UTC and local representations
- Copy the unit explicitly required by the destination API
Worked example
Convert the included ten-digit Unix value 1767225600
1767225600The ISO and UTC views identify 2026-01-01 00:00:00 UTC, while the local view depends on the browser timezone. The report also shows the corresponding millisecond value
When this tool helps
- Read exp and iat claims from a token
- Debug log times across time zones
- Convert a date into API-ready epoch units
Accuracy and safety notes
- A Unix timestamp does not contain a timezone
- Ambiguous human date strings can parse differently, so prefer ISO 8601 with an explicit offset
Frequently asked questions
Does XXF upload or store my data?+
No. The conversion runs locally in your browser. Your input is not sent to XXF, stored on a server or used for training.
Are seconds and milliseconds both supported?+
Yes. Numeric values are detected by length, and the report includes both Unix seconds and milliseconds.