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PQlocalTZInfo(3)               libpqtypes Manual              PQlocalTZInfo(3)


NAME

       PQlocalTZInfo - Gets the local machine's timezone information.


SYNOPSIS

       #include <libpqtypes.h>

       void PQlocalTZInfo(time_t *t, int *gmtoff, int *isdst, char **tzabbrp);


DESCRIPTION

       This function retrieves the local machine's timezone information.

       If the t argument is not NULL, it represents a time_t value to get
       timezone information for.  If it is NULL, the current time is used.

       The gmtoff argument will be pointed at the number of seconds from GMT,
       same value as the GNU (struct tm).tm_gmtoff extension.

       The isdst argument will be pointed at zero if in standard time, one if
       in daylight savings time and negative one if unknown.

       The tzabbrp argument will be pointed at the timezone abbreviation, like
       PST, ADT, EST, etc..


RETURN VALUE

       None.


EXAMPLES

       This example gets the local timezone information for a file's modified
       time.

              int gmtoff;
              int isdst;
              char *tzabbr;
              struct stat st;

              stat("report.xml", &st);
              PQlocalTZInfo(&st.st_mtime, &gmtoff, &isdst, &tzabbr);


RATIONALE

       libpqtypes needs the ability to get the local machine's timezone
       information for the datetime data types.  It later became apparent that
       a portable way of getting timezone information was very useful and in
       demand.  Thus, this function was made public.


AUTHOR

       A contribution of eSilo, LLC. for the PostgreSQL Database Management
       System.  Written by Andrew Chernow and Merlin Moncure.


REPORTING BUGS

       Report bugs to <libpqtypes@esilo.com>.


COPYRIGHT

       Copyright (c) 2011 eSilo, LLC. All rights reserved.
       This is free software; see the source for copying conditions.  There is
       NO warranty; not even for MERCHANTABILITY or  FITNESS FOR A PARTICULAR
       PURPOSE.


SEE ALSO

       pqt-specs(3)

libpqtypes                           2011                     PQlocalTZInfo(3)

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