Java: convert seconds into day, hour, minute and seconds using TimeUnit

Question

I am using TimeStamp class to convert seconds into Day,Hours,Minutes,Seconds. I used following code

public static void calculateTime(long seconds) {
                 


        

Answer 1

This is my code:

public static String secondsToString(TimeUnit greatestUnit, long sourceDuration, TimeUnit sourceUnit) {

    int ordinal = greatestUnit.ordinal();
    if(ordinal<=sourceUnit.ordinal())
        return String.format("%02d", sourceDuration);

    final long greatestDuration = greatestUnit.convert(sourceDuration, sourceUnit);
    final long rest = sourceDuration - sourceUnit.convert(greatestDuration, greatestUnit);

    return String.format("%02d:", greatestDuration) + secondsToString(TimeUnit.values()[--ordinal], rest, sourceUnit);
}

or by loop

public static String secondsToStringByLoop(TimeUnit greatestUnit, long sourceDuration, TimeUnit sourceUnit) {

    final StringBuffer sb = new StringBuffer();
    int ordinal = greatestUnit.ordinal();

    while(true){
        if(ordinal<=sourceUnit.ordinal()) {
            sb.append(String.format("%02d", sourceDuration));
            break;
        }

        final long greatestDuration = greatestUnit.convert(sourceDuration, sourceUnit);
//          if(greatestDuration>0 || sb.length()>0)
        sb.append(String.format("%02d:", greatestDuration));

        sourceDuration -= sourceUnit.convert(greatestDuration, greatestUnit);
        greatestUnit = TimeUnit.values()[--ordinal];
    };

    return sb.toString();
}

usage example:

String str = secondsToString(TimeUnit.DAYS, 1000, TimeUnit.SECONDS);

function returns: "00:00:16:40" (days:hours:minutes:seconds)

str = UnitsConverter.secondsToString(TimeUnit.DAYS, 1000, TimeUnit.MINUTES);

returns: "00:16:40" (days:hours:minutes)

str = UnitsConverter.secondsToString(TimeUnit.MINUTES, 1000, TimeUnit.SECONDS);

returns: "16:40" (minutes:seconds)