On Aug 18, 2008, at 11:52 PM, Andrew Ross wrote:

> On Mon, Aug 18, 2008 at 10:09:42PM -0700, Alan Irwin wrote:
>> On 2008-08-18 21:32-0700 Alan W. Irwin wrote:
>>
>>> On 2008-08-18 20:17-0700 Jerry wrote:
>>>>
>>>> As I see it, the first thing that has to be reckoned with is why  
>>>> x29c.c is
>>>> mislabeling the axis on OS X. I've pasted a screen shot as a PDF  
>>>> but I
>>>> suppose it won't survive the list mail process.
>>>
>>> No, it got attached fine, but its first label is 1970-01-14 which  
>>> is not at
>>> all in agreement with the C result I get here whose first label is
>>> 2005-12-14 (then every two weeks after that in agreement with the  
>>> "Hours of
>>> television watched in Dec 2005 / Jan 2006" title).
>>>
>>> Hazen, does your 3rd page x29 C result on Mac OS X agree with  
>>> Jerry's or mine?
>>
>> Jerry, see also http://plplot.sourceforge.net/examples-data/demo29/ 
>> x29.03.png
>> which IIRC was generated on a Debian sarge box by Hazen (not his  
>> Mac OS X
>> system) and agrees with the result I get on my Debian lenny box.
>
> There are really only 2 options here.
>
> 1) mktime doesn't work on Mac OS X.
> 2) Mac OS X does not honour the TZ system variable correctly.
>
> Given that C example 29 used to work, I suspect mktime is OK. Does it
> make any difference if you set TZ to be "UTC" rather than ""?
>
> Change
>   setenv("TZ", "", 1);
> to
>   setenv("TZ", "UTC", 1);
>
> Perhaps it doesn't like the blank TZ string?
>
> Andrew
>
Sorry--no change with "UTC" instead of "".
Jerry

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