Re: How to convert x (elapsed) milliseconds into human-readable format "..d..h..m..s" ?

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.help

Date:

Sun, 13 Sep 2009 11:20:46 -0400

Message-ID:

<h8j2kf$lsr$1@news.albasani.net>

Ulf Meinhardt wrote:

Assume I have a number of milliseconds.

How can I convert this value into a more human-readable format
with days, hours, minutes and seconds like:

56d17h23m56s

If the number of days is equals to 0 then the "d" part should be omitted.

<https://jsr-310.dev.java.net/>

John B. Matthews wrote:

One is often
tempted to enlist DateFormat in the struggle: it works well for elapsed
times < 24 hours, but days are numbered from one, rather than zero.

<code>
import java.text.DateFormat;
import java.text.ParseException;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.TimeZone;

/** @author Lew, JBM */
public class Date7 {

    private static final long MS_DAY = 24 * 60 * 60 * 1000;
    private static final DateFormat df =
        new SimpleDateFormat("D : HH : mm : ss : S");

    public static void main(String[] args) throws ParseException {
        df.setTimeZone(TimeZone.getTimeZone("GMT"));
        for (int i = 0; i < 5; ++i) {
            print(i * MS_DAY);
            print(i * MS_DAY + MS_DAY - 1);
        }
    }

    private static void print(long elapsed) {
        System.out.println(df.format(new Date(elapsed)));
    }
}
</code>

<console>
$ make run
javac -d build/classes -sourcepath src src/date/Date7.java
java -cp build/classes date.Date7
1 : 00 : 00 : 00 : 0
1 : 23 : 59 : 59 : 999
2 : 00 : 00 : 00 : 0
2 : 23 : 59 : 59 : 999
3 : 00 : 00 : 00 : 0
3 : 23 : 59 : 59 : 999
4 : 00 : 00 : 00 : 0
4 : 23 : 59 : 59 : 999
5 : 00 : 00 : 00 : 0
5 : 23 : 59 : 59 : 999
</console>

--
Lew