4:27 p.m.
I don't know whether this is relevant at this stage.
I've been putting together a few noddy Javascript examples. I noticed
tonight that the date function shows the time zone as being +02:00 and
shows the time as being 2 hours later than UTC. I'm wondering if it
is adding DST to a time that already has DST. My Iyonix is completely
set up for the UK. AFAIK it's the settings you'd expect anyone in the
UK to have.
NS #2953.
Dave
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5:55 a.m.
Dave Higton wrote
I don't know whether this is relevant at this stage.
I've been putting together a few noddy Javascript examples. I
noticed
tonight that the date function shows the time zone as being +02:00 and
shows the time as being 2 hours later than UTC. I'm wondering if it
is adding DST to a time that already has DST. My Iyonix is completely
set up for the UK. AFAIK it's the settings you'd expect anyone in the
UK to have.
NS #2953.
seems to work ok on my Iyonix
http://rickman.orpheusweb.co.uk/testing/test5.html
John
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WS
2:36 p.m.
In message <32ab48fd54.iyojohn(a)rickman.argonet.co.uk>
John Rickman Iyonix <rickman(a)argonet.co.uk> wrote:
Dave Higton wrote
> I don't know whether this is relevant at this stage.
> I've been putting together a few noddy Javascript examples. I noticed
> tonight that the date function shows the time zone as being +02:00 and
> shows the time as being 2 hours later than UTC. I'm wondering if it is
> adding DST to a time that already has DST. My Iyonix is completely set
> up for the UK. AFAIK it's the settings you'd expect anyone in the UK to
> have.
> NS #2953.
seems to work ok on my Iyonix
http://rickman.orpheusweb.co.uk/testing/test5.html
Yours doesn't seem to create much output at all - certainly no date,
although the code is clearly in there. Images:
http://davehigton.me.uk/Images/Daves
http://davehigton.me.uk/Images/Johns
Dave
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4:25 p.m.
Dave Higton wrote
Yours doesn't seem to create much output at all - certainly no
date,
although the code is clearly in there.
here is what I see:
http://rickman.orpheusweb.co.uk/nolink/jsdate.jpg
NS #2863
John
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2:56 p.m.
In message <626c82fd54.iyojohn(a)rickman.argonet.co.uk>
John Rickman Iyonix <rickman(a)argonet.co.uk> wrote:
Dave Higton wrote
>> http://rickman.orpheusweb.co.uk/testing/test5.html
> Yours doesn't seem to create much output at all - certainly no date,
> although the code is clearly in there.
here is what I see:
http://rickman.orpheusweb.co.uk/nolink/jsdate.jpg
NS #2863
Ah, yes. If I go back to #2864 (I don't have #2863), I get the same
result as you. I also get the correct time and time zone from my JS
sample. Clearly the JS interpreter has changed.
Dave
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3:52 p.m.
In message <5eb0fefc54.DaveMeUK(a)my.inbox.com>
Dave Higton <dave(a)davehigton.me.uk> wrote:
I don't know whether this is relevant at this stage.
I've been putting together a few noddy Javascript examples. I noticed
tonight that the date function shows the time zone as being +02:00 and
shows the time as being 2 hours later than UTC. I'm wondering if it
is adding DST to a time that already has DST. My Iyonix is completely
set up for the UK. AFAIK it's the settings you'd expect anyone in the
UK to have.
NS #2953.
Right, I've tracked this down... sort of.
In duktape.c, function duk_bi_date_get_local_tzoffset_gmtime() is
called, but returns 7200.
The salient pints are:
gmtime_r(&t, &tms[0]);
localtime_r(&t, &tms[1]);
/* At ths point, tms[0].tm_hour is the UTC hour, tms[0].tm_isdst is 0;
tms[1].tm_hour is the local hour (1 greater than the UTC hout 'cos
we're currently in daylight savings), and tms[1].tm_isdst = 1.
I think those values are what one would expect. */
t1 = mktime(&tms[0]);
t2 = mktime(&tms[1]);
if (tms[1].tm_isdst > 0) {
t2 += 3600;
}
/* Now why on earth do they do that? t2 is a local time, and as such
is already corrected for DST - shouldn't it be? */
return (t2 - t1);
This is around lines 27864 to 27910 in duktape.c.
I'm not finding clear answers on the Internet as to whether localtime_r()
should return numbers that already directly represent the local legal
time, or the non-DST time in that time zone and expect the tm_isdst flag
to be used to add an hour offset.
Dave
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4:24 a.m.
On Sun, Sep 20, 2015 at 21:52:05 +0100, Dave Higton wrote:
Right, I've tracked this down... sort of.
Thanks for your investigation.
I wonder if this might be, in part, due to the horrors of the mess I made
of the time functions for our duktape binding.
If you're confident that it's a fault built into duktape then we can go to
duktape's authors, but before then, be aware that in order to be more
cross-platform, we do replace some of duktape's time functions with our own
which might be subtly different in their interpretations (thus causing the
issue).
If you continue to believe it to be duktape's problem then let me know and
I'll contact the upstream author (or you can yourself).
Again thank you for doing this investigatory work.
D.
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6 comments
3 participants
participants (3)
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Daniel Silverstone -
Dave Higton -
John Rickman Iyonix