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Enter a Unix timestamp and click To Date to see the date in UTC and your local time zone, or enter a date and click To Timestamp to get the epoch value in seconds and milliseconds. Use Now to insert the current timestamp. Everything runs locally in your browser.
No. All conversion happens entirely in your browser with JavaScript — nothing you enter is sent to a server, so it works offline.
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since 1970-01-01 00:00:00 UTC, not counting leap seconds. It's a compact, timezone-independent way to represent a moment in time.
Both are supported. The converter auto-detects the unit by magnitude: values with 13 or more digits are treated as milliseconds, and shorter values as seconds. Converting a date back gives you both.
Converting a timestamp shows the result in both UTC and your browser's local time zone. When converting a date to a timestamp, the epoch value is absolute, so it's the same regardless of time zone.