Java - ZonedDateTime minus milliseconds

import java.time.ZonedDateTime;

import java.time.format.DateTimeFormatter;

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public class Example {

​

    public static void main(String[] args) {

        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy_MM_dd__HH_mm_ss_SSS");

​

        ZonedDateTime zonedDateTimeNow = ZonedDateTime.now();

        System.out.println(zonedDateTimeNow.format(formatter) + " <- NOW");

​

        // minus 500 millis

        // 1_000_000_000 == 1 millis

        // 10^9 == 1 millis

        zonedDateTimeNow = zonedDateTimeNow.minusNanos(1000000000L / 2);

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        System.out.println(zonedDateTimeNow.format(formatter) + " <- minus 500 millis");

        System.out.println("_____________________^");

    }

}

2021_09_26__17_49_54_967 <- NOW

2021_09_26__17_49_54_467 <- minus 500 millis

_____________________^