On Thu, 5 Sep 2013 16:13:07 -0700, Charles Mills wrote:
>
>2. Does setting timezone_name to EST or PDT make sense? Is EST or PDT an
>appropriate sort of setting?
>
To be POSIXly correct, you should follow:
Title: z/OS V1R13.0 XL C/C++ Programming Guide
Document Number: SC09-4765-12
8.4.1 Using the TZ or _TZ environment variable to specify time zone
...
The TZ or _TZ environment variable has the following format.
________________________________________________________________________
| |
| TZ=standardHH[:MM[:SS]] |
| [daylight[HH[:MM[:SS:]]] |
| [,startdate[/starttime],enddate[/endtime]]] |
| |
|________________________________________________________________________|
Neither that nor POSIX gives an example in the glory of its full complexity.
But in, e.g.:
http://www.gnu.org/software/libc/manual/html_node/TZ-Variable.html
EST+5EDT,M4.1.0/2,M10.5.0/2
But I prefer (and shall surely be castigated here for) the convention prevalent
on most open systems (opener, that is, than z/OS):
510 $ TZ=Australia/Canberra date; TZ=America/New_York date
Fri Sep 6 13:51:17 EST 2013
Thu Sep 5 23:51:17 EDT 2013
(Yes, note the E?T ambiguity.)
This even gives correct results for 2006 and earlier, which the POSIX
convention, adhered to by z/OS can not. (It's compatible; the POSIX
format is still supported.)
>3. Is setenv() the most reasonable way to set timezone_name?
>
I believe I've used tzset():
int showtz ( char *tz ) {
putenv( tz );
if ( 0 ) tzset(); /* Not needed for strftime. */
return( showit( tz ) ); }
-- gil
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