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

public class Main {
	public static void main(String[] args) {
		String d = "2021-08-27 06:25:00.716241+00:00";
		DateTimeFormatter dtfInput = DateTimeFormatter.ofPattern("u-M-d H:m:s.SSSSSSXXX", Locale.ENGLISH);
		OffsetDateTime odt = OffsetDateTime.parse(d, dtfInput);

		DateTimeFormatter dtfOutput = DateTimeFormatter.ofPattern("uuuu-MM-dd'T'HH:mm:ss", Locale.ENGLISH);
		String str = odt.format(dtfOutput);
		System.out.println(str);

		// Add 5 minutes to it
		odt = odt.plusMinutes(5);
		str = odt.format(dtfOutput);
		System.out.println(str);
	}
}