Michael Wohlfart [
http://community.jboss.org/people/mwohlf] created the discussion
"Re: Concept of different locales/time zones in jBPM5"
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http://community.jboss.org/message/563675#563675
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Hi Peter,
I agree with you that timezones should be considered from the beginning of jBPM5's
development.
But I don't see your point about jBPM4, what i don't understand is this:
[...]
The problem is that the current implementation of jBPM neither store nor use UTC time and
date internally: the engine always rely on the local time and date which can lead issues
in an environment where your clients are in different locations (and time zones)
[...]
The current implementation simply returns 'new Date()' which contains the local
timestamp. If the UTC time was returned here that would mean that you store the date
consistently from all locations but at the same time, you would also have to modify the
code in a lot of places (date based queries in service interfaces; JobExecutor service
scheduling etc) so I am a bit reluctant to say that all these parts should be rewritten.
Why do you think the engine uses local time internally?
This is from JavaDoc for java.util.Date:
Although the Date class is intended to reflect coordinated
universal time (UTC), it may not do so exactly, depending on the host environment of the
Java Virtual Machine. Nearly all modern operating systems assume that 1 day = 24 × 60 ×
60 = 86400 seconds in all cases. In UTC, however, about once every year or two there
is an extra second, called a "leap second." The leap second is always added as
the last second of the day, and always on December 31 or June 30. For example, the last
minute of the year 1995 was 61 seconds long, thanks to an added leap second. Most
computer clocks are not accurate enough to be able to reflect the leap-second
distinction.
So my understanding so far was that jBPM4 uses UTC already internally
(which may be off by some seconds on some platforms), but as far as I understand you
don't agree on that?
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