CODEWITHSUNDEEP
java
user1285928
user1285928

Reputation: 1476

How to convert milliseconds into hours and days?

I want to get the JVM start time and uptime. So far I have done this:

public long getjvmstarttime(){
    final long uptime = ManagementFactory.getRuntimeMXBean().getStartTime();
    return uptime;
}

public long getjvmuptime(){
    final long uptime = ManagementFactory.getRuntimeMXBean().getUptime();
    return uptime;
}

But I get the time in milliseconds. How I can convert the time in days and hours. I want to display the milliseconds in this format: 3 days, 8 hours, 32 minutes. Is there amy internal Java method that can convert the milliseconds?

Upvotes: 15

Views: 52591

Answers (4)

ARMEL FOPA
ARMEL FOPA

Reputation: 244

There below code cleanly does the job

package com.company;

import java.util.Scanner;
import java.util.concurrent.TimeUnit;

public class Main {

    public static void main(String[] args) {
        final long milliseconds;
        Scanner in = new Scanner(System.in);

        System.out.println("Enter time in milliseconds: ");
        milliseconds = in.nextLong();

        final long seconds = TimeUnit.MILLISECONDS.toSeconds(milliseconds);

        final long minute = TimeUnit.MILLISECONDS.toMinutes(milliseconds);

        final long hours = TimeUnit.MILLISECONDS.toHours(milliseconds);

        final long days = TimeUnit.MILLISECONDS.toDays(milliseconds);

        if(milliseconds < 1000){
            System.out.println(days +"d:" +hours+"h:" +minute+"m:" +seconds +"s:" +milliseconds +"ms");
        }
        else{
            System.out.println(days +"d:" +hours % 24 +"h:" +minute % 60 +"m:" +seconds % 60 +"s");
        }
    }
}

Sample output

Enter time in milliseconds: 12000000

0d:3h:20m:0s

Upvotes: 1

Dan D.
Dan D.

Reputation: 32391

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());

Upvotes: 40

Jon Lin
Jon Lin

Reputation: 143866

Take a look at Pretty Time. It's a library for generating human reabable time strings from timestamps like milliseconds.

Upvotes: 2

Bill the Lizard
Bill the Lizard

Reputation: 405735

Once you have the time in milliseconds you can use the TimeUnit enum to convert it to other time units. Converting to days will just require one call.

long days = TimeUnit.MILLISECONDS.toDays(milliseconds);

Getting the hours will involve another similar call for the total hours, then computing the left over hours after the days are subtracted out.

Upvotes: 61

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