import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
 
public class Main {
	public static void main(String args[]) {
		DateTimeFormatter dtfInput = DateTimeFormatter.ofPattern("dd-MM-uuuu", Locale.ENGLISH);
		LocalDateTime ldt = LocalDateTime.of(LocalDate.parse("15-08-2021", dtfInput), LocalTime.of(21, 0));
		ZonedDateTime zdt = ldt.atZone(ZoneOffset.UTC);
		System.out.println(zdt);
 
		// Custom format
		DateTimeFormatter dtfOutput = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ssXXX", Locale.ENGLISH);
		String formatted = dtfOutput.format(zdt);
		System.out.println(formatted);
	}
}

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