Value 24 for hourOfDay must be in the range [0,23]

Question

I've got a REST service that I use in my Android app that gives me a time, time only, but it returns also something like

"24:38:00" or "25:15:00"

so, what I need is to parse this time and put a real result out in 24h format. It should be

"00:38:00" and "01:15:00"

I tried use this way

LocalTime localTime = new LocalTime(timeModel.getTimeString());

but i have this error now Cannot parse "24:38:00": Value 24 for hourOfDay must be in the range [0,23]

How can I solve? I need only the time not date

Answer 1

In this case you could assume that these time Strings are not following any rules, because if 24 and 25 exist as values for the "hour" part, why wouldn't they reply with 37?

You can use this to clean this up:

private static String modifyTimeString(String s) {
  //the hour might only be 1 digit, so "the first 2 chars" is not a safe approach
  int colonIndex = s.indexOf(':');
  String hoursString = s.substring(0, colonIndex);
  Integer hours = Integer.valueOf(hoursString);
  if(hours < 24) {
    return s;
  }
  /*while(hours >= 24) {
    hours -= 24;
  }*/
  //smarter, see ronos answer:
  hours = hours % 24;
  //put a leading 0 in there for single-digit-hours
  hoursString = hours.toString();
  if(hours<10) {
    hoursString = "0" + hoursString;
  }
  return hoursString + s.substring(colonIndex);
}

Calling modifyTimeString("25:15:00") returns "01:15:00"