On Wed, Jan 17, 2001 at 01:58:14PM -0600, Andrei Zmievski wrote:
> On Wed, 17 Jan 2001, Jim Winstead wrote:
> > i didn't check how date('Z') is defined (do you add it to local time to get
> > UTC or subtract it?) but it may be that systems where struct tm has a
> > tm_gmtoff member and systems that use the timezone global may
> > define it different ways.
>
> Well, I am in Central timezone so I'd expect my offset to be -21600 (-6
> hours). So, the formula should be UTC + offset.
>
> > they should be made consistent, and the date() documentation updated to
> > tell exactly which way we've made it consistent. :)
>
> And making it consistent would just involve reversing the sign on
> tm_gmtoff member? I just wonder if the sign of tm_gmtoff is consistent
> between platforms.
according to the examples i can find in the single unix spec,
i'd expect timezone to be positive for US/Central time.
http://www.opengroup.org/onlinepubs/007908799/xsh/tzset.html
tm_gmtoff appears to be defined the opposite way.
http://www.netppl.fi/~pp/glibc21/libc_20.html#SEC406
i'd say pick one, and document it.
jim
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