Android Java.Util.Concurrent.Timeunit Convert Milliseconds to Minutes

Android java.util.concurrent.TimeUnit Convert Milliseconds to Minutes

I believe TimeUnit might have added minutes in 1.6: 1.6 docs, 1.5 docs

How to convert Milliseconds to X mins, x seconds in Java?

Use the java.util.concurrent.TimeUnit class:

String.format("%d min, %d sec", 
    TimeUnit.MILLISECONDS.toMinutes(millis),
    TimeUnit.MILLISECONDS.toSeconds(millis) - 
    TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))
);

Note: TimeUnit is part of the Java 1.5 specification, but toMinutes was added as of Java 1.6.

To add a leading zero for values 0-9, just do:

String.format("%02d min, %02d sec", 
    TimeUnit.MILLISECONDS.toMinutes(millis),
    TimeUnit.MILLISECONDS.toSeconds(millis) - 
    TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))
);

If TimeUnit or toMinutes are unsupported (such as on Android before API version 9), use the following equations:

int seconds = (int) (milliseconds / 1000) % 60 ;
int minutes = (int) ((milliseconds / (1000*60)) % 60);
int hours   = (int) ((milliseconds / (1000*60*60)) % 24);
//etc...

How to convert milliseconds to hh:mm:ss format?

You were really close:

String.format("%02d:%02d:%02d", 
TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis) -  
TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)), // The change is in this line
TimeUnit.MILLISECONDS.toSeconds(millis) - 
TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));   

You were converting hours to millisseconds using minutes instead of hours.

BTW, I like your use of the TimeUnit API :)

Here's some test code:

public static void main(String[] args) throws ParseException {
    long millis = 3600000;
    String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
            TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
            TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
    System.out.println(hms);
}

Output:

01:00:00

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I realised that my code above can be greatly simplified by using a modulus division instead of subtraction:

String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
    TimeUnit.MILLISECONDS.toMinutes(millis) % TimeUnit.HOURS.toMinutes(1),
    TimeUnit.MILLISECONDS.toSeconds(millis) % TimeUnit.MINUTES.toSeconds(1));

Still using the TimeUnit API for all magic values, and gives exactly the same output.

From milliseconds to hour, minutes, seconds and milliseconds

Here is how I would do it in Java:

int seconds = (int) (milliseconds / 1000) % 60 ;
int minutes = (int) ((milliseconds / (1000*60)) % 60);
int hours   = (int) ((milliseconds / (1000*60*60)) % 24);

Override androids implementation of TimeUnit

You are not likely to find a solution. Even if you could override the built in TimeUnits class (I don't believe you can) you would have no way to feed the new one into your library and get it to work.

In normal java you could replace the classloader before loading the library but that would be a really bad (and difficult) solution anyway.

If your library is open-source or if you own it, I'd recommend fixing it and rebuilding--seems pretty straight-forward. If you submit a patch and tell them why then it should automatically be included in future versions.

If you don't own it, you have to get the person or group who does to rebuild it (This is the reason old-school programmers hate closed source, even if you are willing to do it yourself, you are often completely blocked).

How to convert milliseconds into hours and days?

The code below does the math you need and builds the resulting string:

private static final int SECOND = 1000;
private static final int MINUTE = 60 * SECOND;
private static final int HOUR = 60 * MINUTE;
private static final int DAY = 24 * HOUR;

// TODO: this is the value in ms
long ms = 10304004543l;
StringBuffer text = new StringBuffer("");
if (ms > DAY) {
  text.append(ms / DAY).append(" days ");
  ms %= DAY;
}
if (ms > HOUR) {
  text.append(ms / HOUR).append(" hours ");
  ms %= HOUR;
}
if (ms > MINUTE) {
  text.append(ms / MINUTE).append(" minutes ");
  ms %= MINUTE;
}
if (ms > SECOND) {
  text.append(ms / SECOND).append(" seconds ");
  ms %= SECOND;
}
text.append(ms + " ms");
System.out.println(text.toString());

how to show milliseconds in days:hours:min:seconds

A simple way to calculate the time is to use something like

long seconds = timeInMilliSeconds / 1000;
long minutes = seconds / 60;
long hours = minutes / 60;
long days = hours / 24;
String time = days + ":" + hours % 24 + ":" + minutes % 60 + ":" + seconds % 60; 

This will work if you have more than 28 days, but not if you have a negative time.

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