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Technical reference
Convert Unix timestamps to readable dates and back, locally in your browser. Supports seconds and milliseconds, live local and UTC clocks, and multi-timezone preview.
Supported inputs
- Unix timestamp (seconds): e.g. 1767225600
- Unix timestamp (milliseconds): e.g. 1767225600000
- ISO 8601 string: e.g. 2026-01-01T00:00:00Z
- Auto-detects input format and shows the detected type.
Example: timestamp to date
A timestamp represents the offset from 1970-01-01 00:00:00 UTC. Seconds and milliseconds differ in digit count. The tool auto-detects but you can specify manually when ambiguous.
Input: 1767225600
Local: 2026-01-01 08:00:00 (UTC+8)
UTC: 2026-01-01 00:00:00
ISO: 2026-01-01T00:00:00.000ZLimits
- Displayed local time depends on your browser system timezone setting.
- 32-bit Unix timestamps overflow after 2038-01-19 03:14:07 UTC (Year 2038 problem).
- ISO 8601 parsing uses native JavaScript Date, which may handle some extended formats inconsistently.
Frequently asked questions
Is the timestamp in seconds or milliseconds?
It depends on the source. Unix timestamps traditionally use seconds, while JavaScript Date.now() returns milliseconds. The tool auto-detects by digit count: 10 digits is seconds, 13 is milliseconds.
Why do results differ across timezones?
The same timestamp displays as different local times in different timezones, but represents the same instant. UTC time is always identical.