Solved

date/time Question

Posted on 2004-09-24
16
206 Views
Last Modified: 2010-03-31
I have:

public String getTotalTime(){
            DecimalFormat df = new DecimalFormat();
            return df.format(((this.getDateTill().getTime() - this.getDateFrom().getTime()) / 1000 / 3600) - this.getBreak());
}

if i have:

dateTill =10:00  (DATE format)
dateFrom =14:00  (DATE format)
break = 0.25  (FLOAT format)

i get the totalTime as: 3,75    (i need it to be 3.35 or 3:35)

How can i do it?  Thanks.
0
Comment
Question by:jaggybala1
  • 7
  • 5
  • 3
  • +1
16 Comments
 
LVL 18

Expert Comment

by:armoghan
ID: 12142304
use SimpleDateFormat
0
 
LVL 18

Expert Comment

by:armoghan
ID: 12142307
0
 

Author Comment

by:jaggybala1
ID: 12142393
if i use SimpleDateFormat, can i use float value of 'break' ?

could you please tell me how should i code for DATE with FLOAT using SimpleDateFormat ?
0
Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

 

Author Comment

by:jaggybala1
ID: 12142469
PS: I have been restricted only to use FLOAT for 'break' field.
0
 
LVL 18

Expert Comment

by:armoghan
ID: 12142572
Make it a calender object and subtract the time from its minutes and then get the format
0
 
LVL 18

Assisted Solution

by:armoghan
armoghan earned 20 total points
ID: 12142629
Calendar cal = Calendar.getInstance();
cal.setTime(someDateObject)
cal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE) - this.getBreak());

cal.getTime();


This is kind of pseudo code
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12143210
>> (i need it to be 3.35 or 3:35)
Sure?

Doesn't a break of 0.25 stand for one quarter?
Then 4h - 1 quarter = 3:45
0
 
LVL 37

Assisted Solution

by:zzynx
zzynx earned 60 total points
ID: 12143346
Why not just some maths:

public String getTotalTime(){

    long brutoDiff = (this.getDateTill().getTimeInMillis() - this.getDateFrom().getTimeInMillis())/1000;  // in seconds
    long breakDiff = (long)(3600.0*this.getBreak);  // in seconds
    long difference = brutoDiff - breakDiff;  // in seconds
    long hours = difference / 3600;
    long minutes = ( difference - (hours * 3600) ) / 60;
    return hours + ":" + minutes;   // returns "3:45" in your example
}
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12143398
Oh, 0.25 stands for 25 minutes?
Then replace in the above

       long breakDiff = (long)(3600.0*this.getBreak);  // in seconds
by
       long breakDiff = (long)(6000.0*breakTime);  // in seconds


Then it returns "3:35"
0
 

Author Comment

by:jaggybala1
ID: 12143734
Actually, i see that:

>> Doesn't a break of 0.25 stand for one quarter?
>> Then 4h - 1 quarter = 3:45

is right!

but i get the totalTime as: 3,75

how can i get it as 3.75

Thanks.
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12143783
>> i get the totalTime as: 3,75
>> how can i get it as 3.75

Don't see the difference...
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12143968
Oh, you want to be sure you always have a point (instead of a colon in your locale)?
Is it that?

public String getTotalTime(){

    long brutoDiff = (this.getDateTill().getTimeInMillis() - this.getDateFrom().getTimeInMillis())/1000;  // in seconds
    long breakDiff = (long)(3600.0*this.getBreak);  // in seconds
    long difference = brutoDiff - breakDiff;  // in seconds
    long hours = difference / 3600;
    long minutes = ( difference - (hours * 3600) ) / 60;
    float result = (float)hours + (float)minutes/60.0F;

    DecimalFormatSymbols dfs = new DecimalFormatSymbols();
    dfs.setDecimalSeparator('.');
    java.text.DecimalFormat fmt = new DecimalFormat();
    fmt.setDecimalFormatSymbols(dfs);
    return fmt.format(result);     // returns "3.75" in your case
}
0
 
LVL 37

Accepted Solution

by:
zzynx earned 60 total points
ID: 12144071
So in fact this simply asnwers you question, right?
;°)

public String getTotalTime(){
          DecimalFormat df = new DecimalFormat();
          DecimalFormatSymbols dfs = new DecimalFormatSymbols();
          dfs.setDecimalSeparator('.');
          fmt.setDecimalFormatSymbols(dfs);
          return df.format(((this.getDateTill().getTime() - this.getDateFrom().getTime()) / 1000 / 3600) - this.getBreak());
}

Remark: sure you want to overrule number formatting corresponding with the user's locale?
0
 
LVL 21

Assisted Solution

by:MogalManic
MogalManic earned 20 total points
ID: 12150491
You need to split the time into seperate Hours/minutes/seconds then format them into a string.  See if this thread helps:
http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_21134849.html
0
 
LVL 37

Expert Comment

by:zzynx
ID: 12166934
Thanks for accepting
0
 
LVL 18

Expert Comment

by:armoghan
ID: 12168038
Thanks :)
0

Featured Post

Gigs: Get Your Project Delivered by an Expert

Select from freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
firstswap challenge 20 77
github account with ecipse 1 47
Java DateChooser? 3 36
why cannot we forward request once the response is committed 2 42
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question