A simple Java/Groovy code to convert a given seconds value to hh:mm:ss format

formatSeconds.groovy

import java.util.concurrent.TimeUnit

void convert(int secondsToConvert) {
    long millis = secondsToConvert * 1000;
    long hours = TimeUnit.MILLISECONDS.toHours(millis);
    long minutes = TimeUnit.MILLISECONDS.toMinutes(millis) % TimeUnit.HOURS.toMinutes(1);
    long seconds = TimeUnit.MILLISECONDS.toSeconds(millis) % TimeUnit.MINUTES.toSeconds(1);

    String format = String.format("%02d:%02d:%02d", Math.abs(hours), Math.abs(minutes), Math.abs(seconds));
    
    println("$secondsToConvert seconds = " + format);
}

convert(5)
convert(10)
convert(40)
convert(59)
convert(60)
convert(80)
convert(100)
convert(119)
convert(120)
convert(121)
convert(3600)
convert(8640)
convert(86400)

/*
 *
5 seconds = 00:00:05
10 seconds = 00:00:10
40 seconds = 00:00:40
59 seconds = 00:00:59
60 seconds = 00:01:00
80 seconds = 00:01:20
100 seconds = 00:01:40
119 seconds = 00:01:59
120 seconds = 00:02:00
121 seconds = 00:02:01
3600 seconds = 01:00:00
8640 seconds = 02:24:00
86400 seconds = 24:00:00
*
*/