Calculate duration of two points in time ISO 8601

I'm having the following data:

"startAt": "PT0S",
"endAt": "PT21M12.667S"

startAt defines the start of a video and endAt the end of the video. How can I calculate the time between these points? I guess its ISO 8601 and I am using Java, but the library I tried (Joda) doens't work with the endAt paramter.

Jon Skeet
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quotationmark

These are ISO-8601 period values (not points in time) - and Joda Time handles them fine:

import org.joda.time.*;
import org.joda.time.format.*;

public class Test {
    public static void main(String[] args) {
        String startText = "PT0S";
        String endText = "PT21M12.667S";

        PeriodFormatter format = ISOPeriodFormat.standard();
        Period start = format.parsePeriod(startText);
        Period end = format.parsePeriod(endText);

        Duration duration = end.minus(start).toStandardDuration();
        System.out.println(duration); // PT1272.667S
        System.out.println(duration.getMillis()); // 1272667
    }
}

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