Unix Time Converter

Convert between UNIX time and date (offline)

Current UNIX seconds

UNIX time (seconds)

Numbers only. 1970–2100.

Datetime (ISO 8601)

タイムゾーンは左上のトグル（UTC/ローカル）で切替。

All processing happens locally.

Usage

Enter Unix seconds to see the ISO date on the right, or input an ISO date to convert to Unix seconds.

Adjust with the slider and toggle UTC/local at top left.

Example: 0 → 1970-01-01T00:00:00+00:00

Seconds or milliseconds?

UNIX time in seconds, not milliseconds. Using ms yields values 1000× too large.

UTC vs Local?

UTC uses Coordinated Universal Time; Local uses your device time zone for display and parsing.

DST handling?

Local mode follows your device time zone, including DST transitions.

Supported range?

Roughly 1970–2100 by default; you can adjust the slider maximum as needed.

Offline?

Yes. Everything runs locally in your browser.