IMO, the underlying problem with z/OS Unix localtime() is that environment variable initialization is brain dead in z/OS. In other Unix/Posix implementations, /etc/rc initializes environment variables for the "init" process (usually pid=1). All other processes inherit from it.
In z/OS, along with /etc/rc there is /etc/init.options which initializes the environment for the init process, but only *some* z/OS Unix processes inherit from it. z/OS Unix Processes that are "blind dubbed" do not. These include normal batch jobs and started tasks that use z/OS Unix services. What does this mean? Well, you should be able to set TZ in /etc/rc or /etc/init.options and have *all* processes inherit it in their environment. Then all of the localtime() calls get the same system default timezone. from one place. In z/OS however, you have to manually configure TZ for each job that doesn't inherit its environment from the init process. This can cause all sorts of problems in z/OS Unix, but TZ is an easy one to understand. (BTW: You only need to call tzset() if you want to change the current process' timezone after the process starts). I submitted this RFE back in 2014, and it was marked "uncommitted candidate" in 2016, but it doesn't look to me like it made it into V2R4. So I'm not holding my breath. https://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=59716 On Wed, Aug 14, 2019 at 8:06 PM Paul Gilmartin < 0000000433f07816-dmarc-requ...@listserv.ua.edu> wrote: > On Wed, 14 Aug 2019 18:48:22 -0400, Phil Smith III <li...@akphs.com> > wrote: > > >Poked around some more, found > > > > > https://groups.google.com/forum/#!msg/bit.listserv.ibm-main/mYYcbXg0lGY/hu0cNy5TO30J > > > >which looked promising, but this: > > [ ... ] > A few suggestions: > Do you also need the date? That should be derived from the same > call to time(); lest midnight intrude. > > 615 $ cat when.c > #include <time.h> > #include <stdio.h> > #include <stdlib.h> > #include <string.h> > > time_t ltime; > > static char hhmmss[9]; > > struct tm *tmptr; > > int main( int argc, char **argv ) { > time(<ime); > > if ( ! getenv( "TZ" ) ) /* Support caller's setting of TZ. */ > setenv("TZ","CST6CDT",1); > > tzset(); > > tmptr = localtime(<ime); > > /* timeptr = asctime(tmptr); > memcpy(&hhmmss, timeptr+11, 8); > hhmmss[8] = 0; > Deprecated; see > http://pubs.opengroup.org/onlinepubs/9699919799/functions/asctime.html#tag_16_21_07 > So: */ > strftime( hhmmss, 9, "%H:%M:%s\0", tmptr ); > > printf( "%s\n", hhmmss); /* show result. */ > return( 0 ); > } > -- gil > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
