Math - milli- prefix

Milli- is a unit prefix used primarily with the metric system. The prefix denotes a factor of 10^−3 or 0.001. It is frequently used in programming and electronics for prefixing units of time and length.

To see all metric prefixes read this article.

Programming language offers simple way to get current time in milliseconds (measured since 1970-01-01).

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const now = Date.now();

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console.log(now);

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public class Program {

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    public static void main(String[] args) {

        long now = System.currentTimeMillis();

        System.out.println(now);

    }

}