How to add missing zeros to time?

Question

Java

LocalDateTime criticalPercentsStart;
LocalDateTime criticalPercentsFinish;

/* <***> */

final var fmt = DateTimeFormatter.ofPattern("H:m:s");
System.out.print(fmt.format(criticalPercentsStart));
System.out.print("    ");
System.out.print(fmt.format(criticalPercentsFinish));

At the output, I get this for example:
16:47:2 16:48:52
And I would like this:
16:47:02 16:48:52
That is, how to add zeros to the date for symmetry?

Answer 1

HH:mm:ss