無料オンラインUnixタイムスタンプコンバーター

Open the tool and click "Now" to see the current Unix timestamp. In JavaScript, you can also get it with Date.now() (milliseconds) or Math.floor(Date.now()/1000) (seconds).

The Unix epoch is 00:00:00 UTC on January 1, 1970 — the moment from which all Unix timestamps are measured. Timestamps before 1970 are negative. The epoch was chosen as a round number in computing history.

Unix timestamp in seconds: 1,700,000,000. Same moment in milliseconds: 1,700,000,000,000. JavaScript's Date.now() and many APIs use milliseconds. C, Python time.time(), and most Unix utilities use seconds. Multiply/divide by 1000 to convert.

Systems using 32-bit signed integers max out at 2,147,483,647 (Unix time) = January 19, 2038. 64-bit systems extend this to the year 292,277,026,596 — effectively infinite. Modern systems already use 64-bit timestamps.

Unix timestamps are always in UTC — they represent absolute time with no time zone. The tool lets you display the human-readable equivalent in any time zone, converting the UTC timestamp to local time for you.

Yes, the Unixタイムスタンプコンバーター on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.

Unixタイムスタンプを読みやすい日時に変換し、その逆も行います。 No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.

No installation needed. The Unixタイムスタンプコンバーター runs entirely in your web browser on any device — desktop, tablet, or mobile.

Completely safe. The Unixタイムスタンプコンバーター processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.

After the page loads for the first time, the Unixタイムスタンプコンバーター works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.

Yes. The Unixタイムスタンプコンバーター uses your browser's built-in time zone data, which includes daylight saving time rules for all supported time zones, keeping results accurate year-round.

The Unixタイムスタンプコンバーター uses your browser's built-in Intl and Date APIs, which automatically account for daylight saving time transitions, leap years, and regional time zone rules. You do not need to make any manual adjustments for these calendar events.

Yes. The Unixタイムスタンプコンバーター is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.

Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.