Convert Unix timestamps to human-readable dates, and dates back to timestamps.
A Unix timestamp (also called epoch time) is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC (the Unix epoch). It is a timezone-independent way to represent a point in time and is widely used in programming, databases, and APIs.
JavaScript, Java, and C# typically work in milliseconds (multiply seconds by 1000), while Unix systems, Python, and most APIs use seconds.