import java.time.*;
 
public class Main {
    public static void main(String[] args) {
        // Start date-time of the day in the system's time zone
        LocalDateTime ldt = LocalDate.now().atStartOfDay();
        System.out.println(ldt);
 
        // Start date-time of the day in a given time zone
        ZoneId tz = ZoneId.of("Europe/London");
        ZonedDateTime zdt = LocalDate.now(tz).atStartOfDay(tz);
        System.out.println(LocalDate.now().atStartOfDay());
    }
}

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