Question

Java String date conversion from one format to another Java Date format

Asked by: VikasGupta79

I need to convert the Java date from one format to another format and get returned date in new format which shoud be java.util.Date object only.

I have written following given below method but I am getting same output as input.

calling of method
convertStringToDateNew("Wed Apr 29 01:12:44 IST 2009", "MM/dd/yyyy HH:mm:ss");

public static Date convertDateToNewFormat(String sDate, String dateFormat)  throws TechnicalException
    {
        SimpleDateFormat expectedDateFormat = new SimpleDateFormat("E MMM dd HH:mm:ss z yyyy");
        SimpleDateFormat requiredDateFormat= new SimpleDateFormat(dateFormat);
       
        Date date = null;
        try
        {
        	if(sDate != null)
        	{
	            date = expectedDateFormat.parse(sDate);
	            String strDate = requiredDateFormat.format(date);
	            System.out.println("String date ="+strDate);
	            date = requiredDateFormat.parse(strDate);
 
           }
        } catch (Exception e)
        {
        	throw new TechnicalException ("Exception in [CommonUtil][convertStringToDate]", e.getMessage());			
        }
        return date;		 
    }

                                  
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Asked On
2009-05-08 at 02:24:20ID24391782
Tags

Java.util.Date

Topic

Java Server Pages (JSP)

Participating Experts
2
Points
50
Comments
16

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Answers

 

by: objectsPosted on 2009-05-08 at 02:28:40ID: 24334268

your method should return astring, not a Date. Date has no idea about formatting

public static String convertDateToNewFormat(String sDate, String dateFormat)  throws TechnicalException
    {
        SimpleDateFormat expectedDateFormat = new SimpleDateFormat("E MMM dd HH:mm:ss z yyyy");
        SimpleDateFormat requiredDateFormat= new SimpleDateFormat(dateFormat);
       
        String strDate = null;
        try
        {
                if(sDate != null)
                {
                    Date date = expectedDateFormat.parse(sDate);
                   strDate = requiredDateFormat.format(date);
                    System.out.println("String date ="+strDate);
           }
        } catch (Exception e)
        {
                throw new TechnicalException ("Exception in [CommonUtil][convertStringToDate]", e.getMessage());                        
        }
        return strDate;            
    }

 

by: VikasGupta79Posted on 2009-05-08 at 02:31:33ID: 24334280

But I need Java.util.Date object to be returned.... if I return String than how will I get date object..

 

by: objectsPosted on 2009-05-08 at 02:33:05ID: 24334290

if you need the date object then you have to handle formatting it elsewhere
the method you have effectively does nothing, it just returns the same date that you pass it

 

by: gibu_georgePosted on 2009-05-08 at 02:34:18ID: 24334299

Try this

public static Date convertDateToNewFormat(String sDate, String dateFormat)  throws TechnicalException
    {
        SimpleDateFormat requiredDateFormat= new SimpleDateFormat(dateFormat);
       
        Date date = null;
        try
        {
              if(sDate != null)
              {
                  date = requiredDateFormat.parse(sDate);
 
           }
        } catch (Exception e)
        {
              throw new TechnicalException ("Exception in [CommonUtil][convertStringToDate]", e.getMessage());                  
        }
        return date;             
    }
                                              
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by: VikasGupta79Posted on 2009-05-08 at 02:36:22ID: 24334320

Ok..how to do that, I mean I have date object which has date in "Wed Apr 29 01:12:44 IST 2009" format now I need to format this date object into "MM/dd/yyyy HH:mm:ss" date format...

 

by: gibu_georgePosted on 2009-05-08 at 02:43:50ID: 24334373

Sorry!! my answer was wrong. I would like to know how you are checking the format of the date after conversion

 

by: gibu_georgePosted on 2009-05-08 at 02:44:55ID: 24334384

Your code is correct and is working fine, just do an SOP of the returned date and it prints out with the format which you passed.

 

by: VikasGupta79Posted on 2009-05-08 at 02:51:39ID: 24334434

SOP will work fine becox its internally calls toString() method ....I have to set the new formatted date string in date object as its required for me to set this formatted date in another method....

 

by: gibu_georgePosted on 2009-05-08 at 03:05:33ID: 24334512

In date object date is kept as time in millis not in any particular format. You can format it for display purposes as string using SimpleDateFormat

 

by: VikasGupta79Posted on 2009-05-08 at 04:03:36ID: 24334808

It does not solve my problem, so is there any way I get the formatted date object

 

by: gibu_georgePosted on 2009-05-08 at 04:10:45ID: 24334852

Why you want a formatted date object?

 

by: VikasGupta79Posted on 2009-05-08 at 04:15:25ID: 24334882

becx
1. I cant shw "Wed Apr 29 01:12:44 IST 2009" this kind of date to user as we have different format on UI
2. I need date object only as I need sort the list of items on date object.

I dont have any control on sorting API's as its framework provided.....so I got stuck here...

 

by: gibu_georgePosted on 2009-05-08 at 04:36:25ID: 24334994

Does the sorting api expects the date in MM/dd/yyyy HH:mm:ss format or will it take any format?

 

by: VikasGupta79Posted on 2009-05-08 at 04:38:19ID: 24335009

our application requirement is MM/dd/yyyy HH:mm:ss  format....so we cant devate from that

 

by: gibu_georgePosted on 2009-05-08 at 04:42:01ID: 24335027

You have control over the presentation part, so format it while displaying only.

 

by: VikasGupta79Posted on 2009-05-08 at 05:52:45ID: 31579357

Thanks allot for your help!!!!

20120131-EE-VQP-002

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