java - get utc timestamp (in milliseconds)

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// import java.time.Instant;

var instant = Instant.now();
var timestamp = instant.toEpochMilli();  // in milliseconds

System.out.println(timestamp);  // e.g. 1716906171362

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var timestamp = System.currentTimeMillis();  // in milliseconds

System.out.println(timestamp);  // e.g. 1716906171362


// Note: The method returns the current time in milliseconds. Note that while the unit of time of the return value 
//       is a millisecond, the granularity of the value depends on the underlying operating system and may be larger.
//       For example, many operating systems measure time in units of tens of milliseconds.


// References:
//
//     1. https://docs.oracle.com/javase/8/docs/api/java/lang/System.html#currentTimeMillis--