Jim,
Do you know which, if any, Apple updates have the required file?
Thanks,
Ken
On Dec 18, 2006, at 10:43 PM, James Stead wrote:
Hi,
I've been working on this problem at a client recently. Pre-1.4
jvm's kept the timezone data as a structure inside a java class,
and 1.4+ jvm's keep the data in the Olson TimeZoneInfo database
http://www.twinsun.com/tz/tz-link.htm. To patch the pre-1.4s the
class file must be replaced. To patch the post 1.4s the database (a
filesystem based structure) must be replaced.
Either may be handled by updating your jdk to a version that has
the update. Alternatively you can patch *only* the date
functionality. To do so for post 1.4, try the tzupdater by Sun
http://java.sun.com/javase/tzupdater_README.html. Prior jdk's
require a modification to the class file. For example, to patch a
1.1.8 version used by WO 4.5 it is possible to decompile the class
in classes.zip, fix the dst start/end dates, and recompile.
Thanks.
Jim
On Dec 18, 2006, at 10:10 PM, Ken Anderson wrote:
Chuck,
The distinction here is that DST is actually starting at a new
time in 2007 (a few weeks earlier than it used to) and there's a
lot of fuss about what JVM's are handling it correctly.
Ken
On Dec 18, 2006, at 10:05 PM, Chuck Hill wrote:
On Dec 18, 2006, at 6:45 PM, Jerry W. Walker wrote:
Hi, Dan,
You're dealing with a Daylight Savings Time problem.
Yes, the notorious One Hour Shift.
I haven't tried to keep up with Java's calendar routines over
the last few months, but if you go to the page on the US Naval
Observatory web site that describes clock changes at:
http://aa.usno.navy.mil/faq/docs/daylight_time.html
...the first paragraph says:
Currently, daylight time begins in the United States
on the first Sunday in April and ends on the last
Sunday in October. On the first Sunday in April,
clocks are set ahead one hour at 2:00 a.m. local
standard time, which becomes 3:00 a.m. local
daylight time. On the last Sunday in October, clocks
are set back one hour at 2:00 a.m. local daylight
time, which becomes 1:00 a.m. local standard time.
These dates were recently modified with the
passage of the Energy Policy Act of 2005, Pub. L.
no. 109-58, 119 Stat 594 (2005). Starting in
March 2007, daylight time in the United States
will begin on the second Sunday in March and end
on the first Sunday in November.
...and therein lies your problem.
As for a workaround, I'm not sure what to suggest. However, I
thought that the later JVMs had adapted to the change in law.
I think that is exactly the problem. We are not in DST now, but
late March will be. Java is very "accurate" WRT time and does
not handle it as we would in day to day life. 9AM March 21 is
not exactly N x 24 hours away, it is N x 24 +/- 1 depending on
which way you are crossing the DST boundary. If you have dates
at midnight, even the date will change! Much fin ensues. If you
don't need the time, setting it to noon will avoid the date
shift. That is of no use to you. You can use different
formatters (with the time zone set differently) for dates in and
out of DST. You could also store the date (at noon) in one field
and the in another.
Java. Dates. If there is a hell on earth for developers, it is
this.
Chuck
On Dec 18, 2006, at 8:31 PM, Dan Faber wrote:
Hi everyone:
I have just run into an apparent NSTimestamp problem. I have a
scheduling program, and it has been working well. Recently we
tried to schedule an appt for March, and the NSTimestamp is
giving us back a time that is one hour earlier than the time
that is designated. This occurs between March 11 and March 31,
2007, a 3 week period. The problem does not seem to occur for
dates before that period or afterwards. It does not appear to
be an NSTimestampFormatter problem, as it exists with or
without using the formatter.
The time is correct in the database after a save, but it
immediately gets displayed an hour early. The problem occurs
with two different versions of the mysql-connector (including
the most recent). It occurs on two different machines, both
running OSX version 10.4.8.
Converting the date to java.util.GregorianCalendar appears to
produce the correct result for
java.util.GregorianCalendar.HOUR_OF_DAY.
So far I have not seen anything on the list about this. Anyone
have any ideas what's up?
Dan Faber
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