Unix to Date Converter
Convert Unix timestamps (seconds or milliseconds) to human-readable dates, ISO 8601, and UTC. Runs entirely in your browser.
Enter a timestamp or date above to convert, or click Use Now to start with the current time.
Quick Reference
| Format | Example |
|---|---|
| Unix (seconds) | 1735689600 |
| Unix (milliseconds) | 1735689600000 |
| ISO 8601 | 2025-01-01T12:00:00Z |
| Date string | Wed, 01 Jan 2025 12:00:00 GMT |
This tool runs entirely in your browser. No data is ever sent to any server.
Timestamp Conversion FAQ
What is Unix to Date conversion?
It converts a numeric Unix timestamp (seconds or milliseconds since January 1, 1970 UTC) into a human-readable date format, including ISO 8601, UTC, and your local timezone representation.
How are seconds vs milliseconds detected?
Timestamps larger than 100 billion are treated as milliseconds (13+ digits). Smaller values are treated as seconds (10 digits for dates around year 2001+). The tool shows the detected format in a badge.
What timezone is used for the output?
The tool shows both UTC and your browser's local timezone. The ISO 8601 output always uses UTC (indicated by the trailing Z). The Local Time output uses your system timezone.
Can I convert negative timestamps?
Yes. Negative Unix timestamps represent dates before January 1, 1970. For example, -86400 represents December 31, 1969.
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