On Sat, Jun 12, 2010 at 07:37, Fink, Andreas <[email protected]> wrote:
> Hi Derrell,
>
> I'm using Firefox Version 3.6.3
>
> My idea for a workaround is that the RpcJava backend can take care of
> the problem while serialization and de-serialization the date objects.
> I'll have a look at it, maybe I'm able to provide such a workaround.
>
The proper way to deal with this is to NEVER send dates that are not
normalized between computers. If you always send UTC timestamps, there is no
daylight savings time conversion to worry about.
Regarding Firefox, I tried running the following program in the playground:
var d = new Date("4/1/1980");
this.warn(d.toUTCString());
d = new Date("5/1/1980");
this.warn(d.toUTCString());
d = new Date("4/1/2010");
this.warn(d.toUTCString());
d = new Date("5/1/2010");
this.warn(d.toUTCString());
The results are as follows:
496761 playground.Application[440]: Tue, 01 Apr 1980 05:00:00 GMT
496769 playground.Application[440]: Thu, 01 May 1980 04:00:00 GMT
496773 playground.Application[440]: Thu, 01 Apr 2010 04:00:00 GMT
496777 playground.Application[440]: Sat, 01 May 2010 04:00:00 GMT
In my timezone, during daylight savings time, the offset is 4 hours, and it
is 5 hours the rest of the year. This is showing that my Firefox 3.5.7 on
Linux knows that daylight savings time isn't yet in effect on 1 April 1980,
but is in effect on 1 May of that year. In 2010, after the rules changed,
both 1 April and 1 May are during daylight savings time.
I highly suspect that JavaScript is using the native date/time functions of
the operating system on which it is running. It may well be that Firefox
3.5.7 provides the incorrect dates if it's running on an old Windows system
(or a not up-to-date Linux system).
In any case, always send UTC dates over the wire, and you'll never have a
conversion problem.
Cheers,
Derrell
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