import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
 
public class Main {
 
	public static void main(String[] args) {
		System.out.println(parse("21:5:20", "H:m:s"));
	}
 
	public static ZonedDateTime parse(String fecha, String pattern) {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern, Locale.ENGLISH);
		LocalTime time = LocalTime.parse(fecha, formatter);
 
		return ZonedDateTime.of(LocalDateTime.of(LocalDate.now(), time), ZoneId.systemDefault());
	}
 
}

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