Unix Timestamp Converter
Convert Unix seconds or milliseconds to UTC dates and ISO dates back to timestamps.
Convert in your browser · No sign-up
Current Unix timestamp
- Seconds
- —
- Milliseconds
- —
Choose the unit explicitly. Date input requires an offset: 2026-09-26T12:00:00+09:00 or 2026-09-26T03:00:00Z. Invalid dates are rejected.
Up to 100,000 UTF-16 units per input · 0 / 100,000
How to use
- Paste your text or load the example.
- Choose the mode or options, then run the tool.
- Review the result, then copy or download the TXT file.
Example
0 → 1970-01-01T00:00:00.000Z
Details and limitations
Convert Unix seconds or milliseconds to UTC dates and ISO dates back to timestamps.
Choose the unit explicitly. Date input requires an offset: 2026-09-26T12:00:00+09:00 or 2026-09-26T03:00:00Z. Invalid dates are rejected.
Text stays in your browser; it is not sent to a conversion server.
Related tools
Format references
Tool page updated: