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Old 10-20-2011, 08:34 PM   #1
freemanl
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Registered: Oct 2011
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EST of Australian timezone does not work


Hello,

I'm new to slackware. I test EST daylight saving time. Time change in October works with no problem. But that in April does not work.

For example, I changed system time to Sun, 3 April 2011, 02:59:30.
After 30 seconds, it moved to 3:00:00. But it should not, it should turn back to 02:00:00 because daylight saving time end.

Does I miss something to do?
Any help would be greatly appreciated!
 
Old 10-21-2011, 03:15 AM   #2
k3lt01
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Registered: Feb 2011
Location: Australia
Distribution: Debian Wheezy, Jessie, Sid/Experimental, playing with Slackware 14.
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Quote:
Originally Posted by freemanl View Post
Does I miss something to do?
Patience is a virtue, wait till daylight savings actually ends, my gut feeling is it will work when the time comes.
 
Old 10-21-2011, 03:32 PM   #3
whk
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Registered: Jun 2005
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Double check your calendar. April 3, 2011 is a Sunday. Ay.


Sat Apr 02 07:23:31 EST 2011 Eastern Summer Time (Victoria)
Sun Apr 03 06:23:31 EST 2011 Eastern Standard Time (Victoria)

Or double check your code.

Here's a simple Java Code on timezone (sorry it's messy)

Code:
import java.util.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat; 
import java.util.Calendar;                                            
import java.util.Date;
class TimesAX
{
public static void main(String[] args)
{
int daysPast=202;    //insert days past

String sp="";
Date date = new Date();
Calendar calVictoria = Calendar.getInstance();
calVictoria.setTimeZone(TimeZone.getTimeZone("Australia/Victoria")); 
TimeZone AusTZ = calVictoria.getTimeZone();
  String tzAName =
      AusTZ.getDisplayName(AusTZ.inDaylightTime(date), TimeZone.LONG);
  String tzANameSt =
      AusTZ.getDisplayName(AusTZ.inDaylightTime(date), TimeZone.SHORT);

  System.out.println("Time in Victoria: " + calVictoria.get(Calendar.HOUR_OF_DAY) + ":"
            +sp+ calVictoria.get(Calendar.MINUTE)
            +" tz "+ tzANameSt +" "+tzAName);
  

      System.out.print("\n"); 

TimeZone.setDefault(AusTZ);
Date AusDate = Calendar.getInstance(AusTZ).getTime();                  
System.out.println(AusDate);                                        
                                                                      
 DateFormat format17 =                                                  
 new SimpleDateFormat("EEEE-MMMM-dd-yyyy  h:mm a zz  Z");              
 System.out.println(format17.format(AusDate));
   System.out.println("180 days future       "+getDateAfterDays(180));
 
String tzAName2 =
      AusTZ.getDisplayName(AusTZ.inDaylightTime(getDateBeforeDays((daysPast+1))), TimeZone.LONG);
String tzAName3 =
      AusTZ.getDisplayName(AusTZ.inDaylightTime(getDateBeforeDays((daysPast))), TimeZone.LONG);

   System.out.println((daysPast+1)+" days past       "
    +getDateBeforeDays((daysPast+1)) +" "+tzAName2);
   System.out.println(daysPast+" days past       "
    +getDateBeforeDays(daysPast)+" "+tzAName3);

}
public static Date getDateAfterDays(int days) {  
 long backDateMS = System.currentTimeMillis() + ((long)days) *24*60*60*1000;  
 Date backDate = new Date();  
 backDate.setTime(backDateMS);  
 return backDate;  
 } 
public static Date getDateBeforeDays(int days) {  
 long backDateMS = System.currentTimeMillis() - ((long)days) *24*60*60*1000;  
 Date backDate = new Date();  
 backDate.setTime(backDateMS);  
 return backDate;  
 } 
}
Though, you might want to rewrite to new acronyms.
EDT Eastern Daylight Time UTC + 11 hours
EST Eastern Standard Time UTC + 10 hours
hth

Last edited by whk; 10-21-2011 at 05:11 PM.
 
  


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