How to parse a 1 or 2 digit hour string with Java?

Question

My parser may encounter \"2:37PM\" (parsed by \"H:mma\") or \"02:37PM\" (parsed by \"hh:mma\"). How can I parse both without resorting to a try-catch?

I receive an erro

Answer 1

You did say you wanted to parse the string. So you can do the following.

for (String s : new String[] { "02:37PM", "2:37PM" }) {
    DateTimeFormatter dtf = DateTimeFormatter.ofPattern("h:mma");
    LocalTime lt = LocalTime.parse(s, dtf);
    System.out.println(lt.format(dtf));
}

Prints

2:37PM
2:37PM