TimeZoneConversion.java

import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

public class HelloWorld{

    public static void main(String []args){
        System.out.println("Hello World");
        LocalTime time = LocalTime.parse("10:00:00"); // 10 AM

        ZonedDateTime utc = ZonedDateTime
                .now(ZoneId.of("Asia/Calcutta")) // current date/time in India
                .with(time) // set time to 10 AM
                .withZoneSameInstant(ZoneOffset.UTC); // convert to UT

        System.out.println("Time in UTC: " + utc);
    }
}