import java.time.OffsetDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
	public static void main(String[] args) {
		DateTimeFormatter formatter = DateTimeFormatter.ofPattern("uuuuMMddHHmmss", Locale.ENGLISH)
										.withZone(ZoneOffset.UTC);

		OffsetDateTime odt = OffsetDateTime.parse("20210817132649", formatter);

		System.out.println(odt);
	}
}