Java 8 Time API: how to parse string of format “mm:ss” to Duration?

Question

I tried to use DateTimeFormatter for it, but not found way. Duration.parse(\"\") only use special format.

Answer 1

IMHO, java 8 doesn't provide any facility for custom duration parsing.

You should to do it "manually". For example (an efficient way) :

import static java.lang.Integer.valueOf;

import java.time.Duration;

public class DurationParser {
    public static Duration parse(String input) {
        int colonIndex = input.indexOf(':');
        String mm = input.substring(0, colonIndex);
        String ss = input.substring(colonIndex + 1);
        return Duration.ofMinutes(valueOf(mm)).plusSeconds(valueOf(ss));
    }
}

Answer 2

You can parse the String yourself and reformat it into the format required by Duration

String value = ... //mm:ss
String[] fields = value.split(":");
return Duration.parse(String.format("P%dM%sS", fields[0], fields[1]));