Java Development

[shreyasb]

I m getting current time zone as ,

String defaultTimeZone = ""+TimeZone.getDefault();

Now I want to get its time for which I m using ,

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");

 for eg, if currentTimeZone  = "Calcutta" then its time is +0530 which will be like ,

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss +0530");

So is there any way for this ?

[peter_strange]

SimpleDateFormat will do this, except for the Time Zone which you will have to code for yourself.  

See this Thread for information on how to do this:

http://supportforums.blackberry.com/t5/Java-Development/Problem-with-SimpleDateFormat-TiemZone/m-p/3... 

[shreyasb]

Thanks for the reply.

I m using Java 1.4 .

Using

TimeZone _timeZone = TimeZone.getDefault();
Calendar _calendar = Calendar.getInstance();
int gmtOffset = _timeZone.getOffset(1, _calendar.get(Calendar.YEAR), _calendar.get(Calendar.MONTH), _calendar.get(Calendar.DATE), _calendar.get(Calendar.DAY_OF_WEEK), _calendar.get(Calendar.MILLISECOND));

I got

gmtOffset = 19800000

but I want it like

+0530 for TimeZone = Asia/Calcutta

So that I can write

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss +0530");

I m using Java1.4 & in Java 1.5 u can write as

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");

to get +0530

but How to get it in Java1.4 ?

[peter_strange]

"I m using Java 1.4 "

i think you using the RIM Supplied APIs as they are what is supported on the BB device.  Either that or you are in the wrong forum! 

You have got the difference as 19800000.  This is in milliseconds.  You can use DateTimeUtilities to convert this to HH:mm format manually, for example, by dividing by DateTimeUtilities.ONE_HOUR to get the number of hours. 

There are other ways of formatting this, for example using SimpleDateFormat.formatLocal() with format HH:mm, but then you start having to worry about converting this to local time. 

I don't know of a way that is less likely to cause errors than doing this manually using DateTimeUtilities.

[shreyasb]

Yes I m using RIM APIs.

Thanks for the reply. I will try this one..

[shreyasb]

After doing like

int gmtOffset = 19800000
int gmtOffset_Hr = gmtOffset/DateTimeUtilities.ONEHOUR;

I got  "gmtOffset_Hr = 5 "

& by doing

int gmtOffset_Min = gmtOffset_Mili/DateTimeUtilities.ONEMINUTE;

 I got  "gmtOffset_Min = 330 "

I havent got Hour Value + or - &  Minute value is coming 330 instead of 30 (+0530 for Asia/Calcutta)

Why so ?

[peter_strange]

int gmtOffset_Min = (gmtOffset_Mili % DateTimeUtilities.ONEHOUR)/DateTimeUtilities.ONEMINUTE;

[shreyasb]

Hey Thanks its coming correct...

for gmtOffet_Hr & gmtOffset_Min & if its -3000 then the - sign is coming in gmtOffset_Hr..

I m getting it as

int gmtOffset_Hr = gmtOffset_Mili/DateTimeUtilities.ONEHOUR;   &
int gmtOffset_Min = (gmtOffset_Mili % DateTimeUtilities.ONEHOUR)/DateTimeUtilities.ONEMINUTE;

right ?

[shreyasb]

But for some time zones ,

(for eg. for Australia/Adelaide, gmtOffset_Hr: 10 , gmtOffset_Min: 30 where as in Phone Settings time format for Adelaide is  +0930)

this issue is for 5-6 time zones..

I m using getOffset(..) of TimeZone class which considers Day Light savings ,

int gmtOffset_Mili = _timeZone.getOffset(1, _calendar.get(Calendar.YEAR), _calendar.get(Calendar.MONTH), _calendar.get(Calendar.DATE), _calendar.get(Calendar.DAY_OF_WEEK), _calendar.get(Calendar.MILLISECOND));

is it correct ?

By using getRawOffset(), its coming correct for Adelaide as  +0930 but getRawOffet() doesnt consider Day Light savings.

By using getRawOffset(), its coming correct for all TimeZones..

So how to handle for Day Light savings ?

[peter_strange]

Probably the best way is to create two dates using a Calendar Object, one with local and one with GMT TimeZone, and subtract one from the other to get the difference.