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Getting duration in hours and minutes from a given date using Java

Hi experts,
I have a date in the format  2010-11-19T04:45:47.000Z which is a String.


Depending on the posted time, I am able to obtain the days ago, months ago and years ago perfectly, using the given piece of code and it works perfect.

Can you please help me by giving me the direction as to how can I get the hours if Integer.parseInt(date)< 1

ie; if the posted date is less than a day, I should get the hours and if it is less than a hour, I need to get it in minutes.

I have been pulling out my hairs in finding a solution for the same.

Any doubt in the question I have posted here or the code I have placed here, please let me know.

Any help in this regard which will guide me to a solution will be well appreciated and awarded with points.

Looking forward,
Warm Regards,
Sreejith
String date = daysBetween2Dates(comment.getDate()).toString();
		
		if(Integer.parseInt(date)<= 31){
			tvPosted.setText(date + " days ago");
		 }else if(Integer.parseInt(date)> 31 && Integer.parseInt(date)<= 360){
			 Integer month = Integer.parseInt(date)/30;
			 tvPosted.setText(month.toString()+ " months ago");
		 }else if (Integer.parseInt(date)> 360){
			 Integer years = Integer.parseInt(date)/360;
			 tvPosted.setText(years.toString()+ " years ago");
		 }






public static Long daysBetween2Dates(String date){
		
		String[] new_s = date.split("T");
		String[]  name = new_s[0].split("-");
		Calendar c1 = Calendar.getInstance(); 	//new GregorianCalendar();
		Calendar c2 = Calendar.getInstance(); 	//new GregorianCalendar();
	    c1.set(Integer.parseInt(name[0]), Integer.parseInt(name[1])-1 , Integer.parseInt(name[2])); 
	   
	    Long days = ((c2.getTime().getTime() - c1.getTime().getTime())/(24*3600*1000));
	 
	    return days;
	}

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Sreejith22
Asked:
Sreejith22
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2 Solutions
 
Sreejith22Author Commented:
Hi Objects,

I tried your code.

The problem here is, I get 0 returned using my code, which calculates the difference between two dates.

But that same code works perfect for year, month and days, not for hours and minutes, since the difference calculating method returns zero for hours and minutes.

sample date which returns zero from my daysBetween2Dates method -- 2010-11-19T06:05:51.000Z


Kindly help
public static Long daysBetween2Dates(String date){
		
		String[] new_s = date.split("T");
		String[]  name = new_s[0].split("-");
		Calendar c1 = Calendar.getInstance(); 	//new GregorianCalendar();
		Calendar c2 = Calendar.getInstance(); 	//new GregorianCalendar();
	    c1.set(Integer.parseInt(name[0]), Integer.parseInt(name[1])-1 , Integer.parseInt(name[2])); 
	   
	    Long days = ((c2.getTime().getTime() - c1.getTime().getTime())/(24*3600*1000));
	    System.out.println("difference is "+days);
	    return days;
	}

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objectsCommented:
The link I posted shows how to calc day,hours, minutes and seconds.
The approach you are using is a bit limited

you're method for parsing the string could also be simplified

http://helpdesk.objects.com.au/java/how-do-i-parse-a-java-string-that-specifies-a-date
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Sreejith22Author Commented:
Hi,
So you suggest me to change the string format which I have - 2010-11-19T06:05:51.000Z to the format shown in link - 06:23 01/05/06

Correct?
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CEHJCommented:
Try something like the below

http://technojeeves.com/joomla/index.php/free/71-difference-between-two-dates-in-java
Date d1 = java.sql.Timestamp.valueOf(cleanTimestamp("2010-11-19T04:45:47.000Z"));
	Date d2 = new java.sql.Timestamp(System.currentTimeMillis());
	long[] diffs = TimeDiff.getTimeDifference(d1, d2);
	TimeDiff.printDiffs(diffs);
    ................

    static String cleanTimestamp(String ts) {
	return ts.substring(0, ts.length() - 1).replaceAll("T", " ");
    }

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objectsCommented:
> So you suggest me to change the string format which I have - 2010-11-19T06:05:51.000Z to the format shown in link - 06:23 01/05/06

no the other way round. You would change the format string to match the format you are using.
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Sreejith22Author Commented:
CEHJ,
Thanks a lot for that snippet. Let me try that out.
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Sreejith22Author Commented:
CEHJ,
Thanks a lot. It worked like a charm.

I got the following output for the given date.

day 0
hour 10
minute 8
second 54
millisecond 245


Would have been awesome, if I could get the month and year also. If so, I need not write another method for calculating month and year.

Regards,
Sree
Timestamp d1 = java.sql.Timestamp.valueOf(cleanTimestamp("2010-11-19T04:45:47.000Z"));
	Timestamp d2 = new java.sql.Timestamp(System.currentTimeMillis());
	long[] diffs = TimeDiff.getTimeDifference(d1, d2);
	//The fields day, hour, minute, second and millisecond
	System.out.println("day"+diffs[0]);
	System.out.println("hour"+diffs[1]);
	System.out.println("minute"+diffs[2]);
	System.out.println("second"+diffs[3]);
	System.out.println("millisecond"+diffs[4]);

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objectsCommented:
code which does exactly what I linked to above :)

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CEHJCommented:
>>Would have been awesome, if I could get the month and year also

Year is possible. Month is not, since a month has no fixed period. Actually the cleaning routine would be more portable as:
static String cleanTimestamp(String ts) {
	return ts.substring(0, ts.length() - 1).replace('T', ' ');
    }

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Sreejith22Author Commented:
final int ONE_YEAR = ONE_DAY*365;
long y = diff / ONE_YEAR;
        diff %= ONE_YEAR;

result[5] = y;


I chaanged the date to 2007-11-19T04:45:47.000Z in order to check this, but the year returned is zero.

Please advise.
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Sreejith22Author Commented:
Hi,
Sorry to post that foolish query!!
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CEHJCommented:
>>final int ONE_YEAR = ONE_DAY*365;

That of course is only approximate - it's not true of leap years

>>the year returned is zero

It will be if it's a partial 'year'. What are the two dates?
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CEHJCommented:
:)
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