Before you start
What you need
One Unix timestamp or preferably an ISO 8601 date with Z or an explicit offset.
Developer & Data
Unix Timestamp Converter
Convert Unix seconds, Unix milliseconds, or a parseable date into exact UTC timestamp facts.
- 01Runs in this browser
- 02Limits are explicit
- 03Copy or download output
No black box
How this tool handles the input
Integers below 100 billion in absolute value are treated as seconds; larger integers are milliseconds. Date text uses browser parsing and output is UTC.
What you get
What the page gives back
UTC ISO time, Unix seconds, Unix milliseconds, and the interpretation used.
Keep in mind
Use the result responsibly
Date text without a time zone can be interpreted in the local browser zone. Include Z or an offset when the instant matters.
Practical uses
Where this tool earns its place
- Read a timestamp copied from an API log.
- Convert an ISO test date to epoch units.
- Check whether a value is seconds or milliseconds.
Verified data boundary
Source text stays on this page.
The published contract marks these tools as client-only processing. Nirmion uses the API only to confirm that this workspace is enabled in MySQL; source values and results are not sent to Flask.