Convert Unix timestamps to human-readable dates and back, with timezone support, millisecond precision and ISO 8601 / RFC 3339 output. Batch mode for lists.
| Format | Value |
|---|
Magnitude detection: ≥1e15 → microseconds, ≥1e12 → milliseconds, otherwise seconds. JavaScript Date works in milliseconds internally; timezone formatting uses Intl.DateTimeFormat.
ISO 8601 is the canonical "Z" / UTC form; RFC 3339 is the same with an explicit timezone offset.
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