A Unix timestamp is the number of seconds that have elapsed since January 1, 1970 (UTC/GMT), also known as the "Unix epoch." It's a universal way to track time, independent of time zones.
Unix timestamps are inherently **UTC (Coordinated Universal Time)**. When converting to human-readable time, this tool uses your **browser's local timezone settings** to display the result. If you're expecting a specific timezone, ensure your input time or your system's timezone is correctly set.
This tool operates with **whole seconds** for Unix timestamps. JavaScript's `Date` object typically handles milliseconds internally, but the displayed Unix timestamp is rounded down to the nearest second.
Yes, the date picker and time inputs allow you to select any date and time, enabling conversions for both historical and future timestamps.