Does System.currentTimeMillis() cater for daylight saving

My question is does System.currentTimeMillis by any means cater for the daylight savings time or in the other case when clocks are moved backwards it repeats it self???????
Its pretty confusing isnt it?

the whole problems with the currentTimeMillis is that it calculates the offset from the System clock - System TimeZone Offset
if the System uses Manual DST or the auto DST is not checked (Windows)
The the user of the system changes manually the clock and the calculation
current millis will be wrong one hour
for example I am in GMT + 2 + DST(1)
GMT is 1200
Local OS shows 1400, and I manually change it to 1500 (DST check box is not checked
the Java will report GMT time 1300 (1500 - 2:00)
whic is wrong.
There is no indication wether this check box is checked or not
If anyone knows how to find out if its checked please tell all

Similar Messages

Rich: calendar problem when automatically adjust clock for daylight saving

Hello, I'm in trouble when the option to automatically adjust clock for daylight saving time is marked. My locale is pt_BR, and when I try to select the day it simply returns to 17.10.2010 on 16.10.2010 took the test in the following component and realized that the same problem occurs when the Windows clock option is selected .
http://livedemo.exadel.com/richfaces-demo/richfaces/calendar.jsf?tab=usage&cid=15374785
I also noticed that this problem occurs in all components of the JSF schedule, no matter what the distribution
http://www.primefaces.org:8080/prime-showcase/ui/calendarDisplay.jsf
Question is, how to make the jsf solve this problem without having to uncheck the Windows clock?
See below for the following attempts to try to fix the problem:
faces-config.xml file
    <locale-config>
         <default-locale> en </ default-locale>
         <supported-locale> en_US </ supported-locale>
         <supported-locale> of </ supported-locale>
         <supported-locale> fr </ supported-locale>
        <supported-locale> es </ supported-locale>
        <default-time-zone-id> Brazil / East </ default-time-zone-id>
    </locale-config>
{code}
Created file DateTimeZoneConverter
{code:java}
import java.util.SimpleTimeZone;
import javax.faces.convert.DateTimeConverter;
public class extends DateTimeZoneConverter DateTimeConverter {
     public DateTimeZoneConverter () {
        super ();
        SimpleTimeZone stz = new SimpleTimeZone (7200000, "Brazil/East");
        this.setTimeZone (stz);
{code}
In the example above I'm forcing the useDaylight is false.
In component:
{code:java}
<rich:calendar id = "periodoVigencia" enableManualInput = "true" datePattern = "dd / MM / yyyy" inputSize = "10"
           value = "# () contratoMBeanList.criteria.dataInicioVigencia"
           label = "# (msg ['contrato.consultarContrato.field.periodovigencia.label'])">
           <f:convertDateTime pattern="dd/MM/yyyy" type="date" dateStyle="short" timeZone="GMT-3"/>
</rich:calendar>
{code}
and in the web.xml file
{code:java}
<context-param>
     <param-name> timezone </ param-name>
      <param-value> GMT-3 </ param-value>
</context-param>
{code}
But nothing worked. And now what do I do? How to fix this problem, there are some more configuration to be done? Help, please!
P.S.:Apologize for my english, I'm Brazilian.

Like I said, were attempts to resolve the error.
OK, now how to solve this problem? Try the test in your area by selecting the day that DST occurs, you will see what will happen the same problem (to select the day that DST occurs on the screen will return one day less), do the test with the demos that I put in the first post, rich: calendar and prime: calendar.
I do not know if it helps, but I noticed the firebug firefox debugging, it does not matter the way you change the locale or timezone, as the current date from the calendar javascript will always be the standard of the machine running the component.

How-to-tick-automatically-adjust-clock-for-daylight-saving-changes-for-domain-users

hi
please help me
I am using windows 2008 as a domain controller with windows XP & windows 7 as a client.
how-to-tick-automatically-adjust-clock-for-daylight-saving-changes-for-domain-users
Thanks in Advance
my mail: [email protected]

Some more information would be nice (how many computers are in the domain?), but I think I have what you're looking for.
What you need to do is change a registry key in the client computers. It's located in the registry at
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
The string name is DynamicDaylightTimeDisabled and the value for this item is
0 (Kind of weird - by entering 0, you're saying "No, I DON'T want to DISable daylight savings time).
Of course, you'll need to deploy this registry information to the clients from the server. There are several ways to do it, but the first one I'd try is to create a registry preference item on the server and deploy it as a GPP.
This link explains how to do this:
http://technet.microsoft.com/en-us/library/cc753092.aspx

Need help preparing for daylight saving

From all the research so far, it seems like we'll have to
have SDK 1.4.2_11 and MX 6.1 updater 1 to ensure that the
application is ok when daylight saving kicks in this Sunday. Is
that correct?
I read
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=d2ab4470
and used the provided dstDates.cfm to test whether our environments
are ok. My questions are:
- If the output of that file shows ok, can we assume that
we're okay without further action?
- We're on MX 6.1 shows version 6,1,0,hf53852_61 and Java
version is 1.4.2_05. We tested 4 environments so far with the
dstDates.cfm and 3 out of 4 showed that it's ok. We're confused
because (1) Our CF and JVM versions are not what recommended for
daylight saving fix; (2) all environments are at the same version,
yet 1 failed showing daylight saving
Please advice.

The bottom line is you need to be on a minimum of CFMX 6.1
Updater and the 1.4.2_11 JDK to apply the solution described in the
TechNote
http://www.adobe.com/go/d2ab4470
The dstDates.cfm should display "Yes" under March 11 (New DST
Start)

Does BOXI 3.1 supports Daylight Saving Time (DST)?

Hi ,
Can any one tell me whether BOXI 3.1 supports Day Light Saving (DST), in case of scheduling reports?
Thanks in Advance,
Raghuveer.

Hi Reddy,
you can contact your vendor regarding this information ....
You need to appy the Business Objects patch, you will need to apply the extended Daylight Saving Time (EDST) patches for your operating system and Java Virtual Machine and Application Servers in order for the Business Objects patches to take effect. Please contact your vendors for updated information.
Regards
KP

IPhone + Outlook, recurring meetings not adjusted for Daylight Saving (Arizona)

Anybody else out there living in Phoenix and syncing with Outlook?
I have an iPhone 4 running iOS 5.0.1 and I sync my calendar with Outlook 2007 running on Windows XP. Recurring meetings that were sent from another timezone are not showing the correct time following the Daylight Saving Time (DST) change on Nov. 6.
For example, I have a recurring meeting for Tuesdays that was originally sent to me July 26, 2011 (during DST, that is) by my customer in California. In Outlook the time is shown as 8:00 AM Pacific Time. During DST this meeting was shown correctly in Calendar as 8:00AM. Today it still shows as 8:00 but should show as 9:00 (8:00 PST = 9:00 MST).
Phone Settings: My iPhone's time zone was originally set this morning to "Set Automatically ON" and it had selected Denver although I'm in Phoenix. I understand that Denver and Phoenix now share the same time. I turned "Set Automatically" off and selected "Phoenix, U.S.A." then resynced, but the appoinment above still shows 8:00.
So how do I fix this? I really don't want my customer to have to resend the invite just to fix an iOS bug.

Not sure if people are still looking at this post, but we did finally find a fix for the issue.
In the end we figured out that one of our exchange mail box users had something faulty in their profile. By "faulty", our exchange admins attempted to move the user's mail profile from one mail store to another, but exchange returned errors when attempting to do so.
In order to "fix" the issue we ended up deleting the mail profile completely from exchange and then recreating it from scratch - scary prospect when having to do this with someone high up the food chain... (prior export and reimport essential otherwise all data is lost)
(the user dealt with many meetings for multiple staff, and was a common factor between all users getting the issue)
I wouldn't call this specifically a MS issue as prior to ipad/iphones, these issues did not occur, and even while it was occuring, turning off mail on ipad/iphones meant the issue did not occur and other email clients had no issues at all
- so it looks like something in the iphone is not quite robust enough to be able to handle a few errors
(alternative theory: perhaps it is the iphone that created the issue in the first place??? We don't know when the issue with the actual mail account started and not enough resources to trowel through log files looking for a needle in a haystack)
Anyway, not sure if this will help everyone with the same issue, but thought I'd share our experience

What Steps to be follow for daylight saving ends in USA as of 2007?

Hi,
I gone through the OSS note 919538 and found that all required entries are place in the table TTZDV on all systems (Development, Quality & Production). We have ECC 5.0 & Oracle 10.2. On WINDOWS 2003 Server, I want to know that whether I need to update any patch or should I shut down all the system for particular time? Please suggest.
Regards,
Rajesh

Rajesh,
SAP runs under the assumption that time is always moving forward. During time fall back this is disrupted, since a certain point in time i.e. 1 AM occurs twice. Once at DST and then again when the clocks are switched back one hour at 2 AM ( changeing to Standard time ). This is known as double-hour and can cause major errors in SAP like
ZDATE_LARGE_TIME_DIFF
ZDATE_ILLEGAL_LOCTIME
ZDATE_ILLEGAL_DBTIME
To prevent the errorsSAP must NOT RUN for 2 hours.
Means shutdown SAP at 1 AM (daylight savings time) and bring it back up at 2 AM (standard time). Check note 102088 for more details
Thanks
Prince Jose

Does System.currentTimeMillis() always return correct time?

Can i rely on it for performance testing?

It gets the time from the computer the application is running on. I can think of at least three things that will change this time:
1. A user (or another program) changes the time.
2. Your operating system changes the time automatically when daylight savings time starts or ends.
3. NTP (Network Time Protocol) is running on your computer and adjusts the time to match the time on some other computer;.

Adjustment for Daylight Saving time

Could anyone please help me on this:
our oracle dbtimezone is currently showing +00:00
our tables have date data type which store date and time as received from an external system sends date/time in UTC
How do I convert the UTC timestamp to BST (British Summer Time) while selecting from the table? I dont want to change the value in the table, just select it as BST.
I have tried different methods like new_time but no luck.
e.g.
select to_date('20120101 23:30:00','YYYYMMDD HH24:MI:SS'), new_time(to_date('20120101 23:30:00','YYYYMMDD HH24:MI:SS'), 'GMT','BST') from dual
returns
01/01/2012 23:30:00     01/01/2012 12:30:00
which I think is incorrect as the BST time should have been 1 hour ahead of GMT. But the above showss it to be 11 hrs behind. I am confused.
Could you please help.

user10237765 wrote:
How do I convert the UTC timestamp to BST (British Summer Time) Maybe like this?
with utc_dates as (
select '20120101 22:30:00' t -- winter time in London = UTC = 22:00
from dual union all
select '20120601 22:30:00' -- summer time in London is UTC advanced by 1 hour, so London time = 23:30
from dual
SELECT
         to_timestamp(t, 'yyyymmdd hh24:mi:ss' ) t,
         from_tz(   to_timestamp(t, 'yyyymmdd hh24:mi:ss' ), '+0:00' ) tz_utc,
         from_tz(   to_timestamp(t, 'yyyymmdd hh24:mi:ss' ), '+0:00' ) at time zone 'Europe/London' london_time
from utc_dates
T                           TZ_UTC                             LONDON_TIME
12/01/01 22:30:00,000000000 12/01/01 22:30:00,000000000 +00:00 12/01/01 22:30:00,000000000 EUROPE/LONDON
12/06/01 22:30:00,000000000 12/06/01 22:30:00,000000000 +00:00 12/06/01 23:30:00,000000000 EUROPE/LONDON
select
t, to_char( from_tz(   to_timestamp(t, 'yyyymmdd hh24:mi:ss' ), '+0:00' ) at time zone 'Europe/London', 'hh24:mi:ss' ) hour
from utc_dates;
T                 HOUR
20120101 22:30:00 22:30:00
20120601 22:30:00 23:30:00 Edited by: kordirko on 2012-01-27 02:12

Daylight saving in the NOkia 6233 ?

Does the Nokia 6233 support Daylight Saving ? If yes, how can I set it in my phone ?

It doesn't do it automatically, like a PC...it isn't that clever. You need to change it yourself. Be sure to set the time zone rather than change the clock, otherwise the phone may display incorrect times for SMS messages etc.
Chris
6230i (the last bug-free Nokia?)
Vodafone UK contract since 1992

Cisco ISE 1.2 Daylight Saving time

Does ISE support DST change?

Time Zone = UTC is best practice for a distributed deployment. Also, remember that if you change the time zone on an ISE, the database is deleted! So, set this during initial setup. BTW, for the Eastern Time Zone in the United States, use EST5EDT in order to allow for Daylight Saving Time.

Daylight Saving Time Patch in 10.2.0.4

Question:
When you apply the 10.2.0.4 patch (linux-64 bit), does this patch include the daylight saving time patch that needed to be applied in earlier releases?

I know that. I was looking for the readme file but my metalink account did not have access to it. I was hoping that the forum would fill in the gap for me.
In this situation, I should have installed the 10.2.0.1 database, then the DST patch and then the 10.2.0.4. Instead, I got ahead of myself and did the 10.2.0.4 patch first. I was just wondering if the DST patch was included in the 10.2.0.4 by now. The good news is that I had my metalink updatred so I have access to the readme file now. I'm glad you knew the answer. Oh wait, you don't.

System.currentTimeMillis() not respecting system clock

How does System.currentTimeMillis() work? I thought it checked the system clock. But I have an application that monitors the clock and I try to catch changes in it (for instance if the user changes his/her clock during runtime). But the System.currentTimeMillis() seems to ignore the time changes of the sytem clock. Any ideas?

I had already done that. That is why I posted. I
could have sworn it worked from previous experience,
but I am not seeing it work now...The following code:import java.io.*;
import java.util.*;
public class TimeDemo {
    public static void main(String[] args) {
        try {
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
            System.out.println(System.currentTimeMillis());
            br.readLine();
            System.out.println(System.currentTimeMillis());
        catch (Exception e) {
            System.out.println(e);
}Produces the following output:
$ java TimeDemo
1120149951371
1117644363468 You'll note that time appears to have gone backwards - but in fact I set the clock back during the readLine block. So I think it does respond to changing the clock (at least under Solaris on a SPARC with Java 1.5).

System.currenttimemillis() returns value ..can't decode it

Does System.currenttimemillis() return milli seconds elapsed after Jan 1, 1970... does it have no relation with our current time...
When i did it and print it out .. my millis were the last 3 digits and secs were the 2 dgits before miiliseconds..
eg: XXXXXXXssmmm
or was it just a mere coincidence...very confused..

I was always taught to use Calendar to access individual fields (and DateFormats for formatting and parsings). One reason you aren't supposed to just take the timestamp value (System.currentTimeMillis()) is that there are complications: for example, because of Earth's wobbly orbit there are things called "leap seconds" that may be added to years, so you can't assume each day consists of exactly 24*60*60 seconds (even ignoring DST). But then I wrote this code:
import java.text.*;
import java.util.*;
public class Currently {
    public static void main(String[] args) {
        long now = System.currentTimeMillis();
        Date date = new Date(now);
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS Z");
        TimeZone tz = TimeZone.getTimeZone("GMT");
        sdf.setTimeZone(tz);
        String output = sdf.format(date);
        System.out.format("%d --> %s%n", now, output);
        long millis = now % 1000;
        now /= 1000;
        long seconds = now % 60;
        now /= 60;
        long minutes = now % 60;
        now /= 60;
        long hours = now % 24;
        System.out.format("Directly from timestamp %02d:%02d:%02d.%03d%n", hours, minutes, seconds, millis);
}I'm not suggesting one abandon Calendar and DateFormat, but where are the leap seconds since 1970?

No daylight-saving time auto-adjust?

Using a Lumia 800 in the UK and (believe it or not) only just realised that it hasn't auto-corrected for daylight-saving time. Can't see an option for it either - am I just missing a really obvious setting somewhere? Time/date has many place options but no DST - is that correct?
Solved!
Go to Solution.

I think my experience may help.
I have had hours and hours of frustration with syncing my phone with Outlook calendar because of the way the date and time settings are described on my Nokia phone.
My Timezone is GMT+10 regardless of whether my location is currently in Daylight Saving. The automatic Daylight Saving settings on my computer adjust the time setting by plus 1 hour when Daylight Saving starts.
On the phone, however, setting the time works in a totally weird way. To get the right time on calendar events synced from my computer, I have to set up the phone according to the actual GMT time difference on the day I do the settings. Right now I'm in Daylight Saving so I have to put my Timezone as GMT+11. If I was doing the settings in mid-winter I would have to set the Timezone as GMT+10.
I just discovered this solution today! What a relief. My calendar events now appear at the same time on my phone as on the computer!
However, the whole Nokia time setup arrangement is quite incorrect and that explains the extremely long sequence of complaints on these discussion pages - going back to at least 2004.
It's very straightforward. My Timezone is GMT+10: it's GMT+10 in midsummer and it's GMT+10 in midwinter. A Daylight Saving adjustment doesn't ever change anyone's Timezone.
If Nokia used the correct meaning of Timezone, no-one would be having any problems with syncing events from their computer to their phone.
I have contacted Nokia separately about their serious error in misunderstanding the meaning of Timezone.

Does System.currentTimeMillis() cater for daylight saving

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