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Timestamp converter.
Unix seconds or milliseconds to ISO, UTC and relative time — with automatic unit detection and bulk rows.
1790330876s1790330876221ms2026-09-25T10:07:56.221Z| ISO | UTC | Relative |
|---|---|---|
| 2026-09-25T10:07:56.000Z | Fri, 25 Sep 2026 10:07:56 GMT | now |
| 2024-06-01T00:00:00.000Z | Sat, 01 Jun 2024 00:00:00 GMT | 2 years ago |
10 digits → seconds · ≥13 digits → milliseconds · anything else → Date.parse. All math in your TZ (UTC).
🔒 Privacy — runs 100% locally
No uploads · no cookies · works offline after load. View Source if you don't believe it.
How to use.
- Paste epoch numbers or date strings, one per line.
- Read ISO / UTC / relative side by side — units auto-detect.
- Press Use now to start from the current second.
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FAQ.
Seconds or milliseconds?
Auto-detected by magnitude: 10 digits → seconds, 13 digits → milliseconds. Ambiguous values assume seconds.
Which timezone?
Relative and local columns use your browser timezone (shown in the header); ISO/UTC are absolute.