Also removed the function not just the call, sorry.

src/interfaces/ecpg/pgtypeslib/dt_common.c

-/* $PostgreSQL: pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c,v 1.39 2007/05/21 07:04:00 meskes Exp $ */
+/* $PostgreSQL: pgsql/src/interfaces/ecpg/pgtypeslib/dt_common.c,v 1.40 2007/05/21 07:07:48 meskes Exp $ */
 
 #include "postgres_fe.h"
 
@@ -1090,159 +1090,6 @@ GetCurrentDateTime(struct tm * tm)
 	abstime2tm(time(NULL), &tz, tm, NULL);
 }
 
-/* DetermineLocalTimeZone()
- *
- * Given a struct tm in which tm_year, tm_mon, tm_mday, tm_hour, tm_min, and
- * tm_sec fields are set, attempt to determine the applicable local zone
- * (ie, regular or daylight-savings time) at that time.  Set the struct tm's
- * tm_isdst field accordingly, and return the actual timezone offset.
- *
- * This subroutine exists to centralize uses of mktime() and defend against
- * mktime() bugs/restrictions on various platforms.  This should be
- * the *only* call of mktime() in the backend.
- */
-static int
-DetermineLocalTimeZone(struct tm * tm)
-{
-	int			tz;
-
-	if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
-	{
-#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
-
-		/*
-		 * Some buggy mktime() implementations may change the year/month/day
-		 * when given a time right at a DST boundary.  To prevent corruption
-		 * of the caller's data, give mktime() a copy...
-		 */
-		struct tm	tt,
-				   *tmp = &tt;
-
-		*tmp = *tm;
-		/* change to Unix conventions for year/month */
-		tmp->tm_year -= 1900;
-		tmp->tm_mon -= 1;
-
-		/* indicate timezone unknown */
-		tmp->tm_isdst = -1;
-
-		if (mktime(tmp) != (time_t) -1 && tmp->tm_isdst >= 0)
-		{
-			/* mktime() succeeded, trust its result */
-			tm->tm_isdst = tmp->tm_isdst;
-
-#if defined(HAVE_TM_ZONE)
-			/* tm_gmtoff is Sun/DEC-ism */
-			tz = -tmp->tm_gmtoff;
-#elif defined(HAVE_INT_TIMEZONE)
-			tz = (tmp->tm_isdst > 0) ? TIMEZONE_GLOBAL - SECS_PER_HOUR : TIMEZONE_GLOBAL;
-#endif   /* HAVE_INT_TIMEZONE */
-		}
-		else
-		{
-			/*
-			 * We have a buggy (not to say deliberately brain damaged)
-			 * mktime().  Work around it by using localtime() instead.
-			 *
-			 * First, generate the time_t value corresponding to the given
-			 * y/m/d/h/m/s taken as GMT time.  This will not overflow (at
-			 * least not for time_t taken as signed) because of the range
-			 * check we did above.
-			 */
-			long		day,
-						mysec,
-						locsec,
-						delta1,
-						delta2;
-			time_t		mytime;
-
-			day = (date2j(tm->tm_year, tm->tm_mon, tm->tm_mday) -
-				   date2j(1970, 1, 1));
-			mysec = tm->tm_sec + (tm->tm_min + (day * HOURS_PER_DAY + tm->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
-			mytime = (time_t) mysec;
-
-			/*
-			 * Use localtime to convert that time_t to broken-down time, and
-			 * reassemble to get a representation of local time.
-			 */
-			tmp = localtime(&mytime);
-			if (!tmp)
-			{
-				tm->tm_isdst = 0;
-				return 0;
-			}
-			day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
-				   date2j(1970, 1, 1));
-			locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
-
-			/*
-			 * The local time offset corresponding to that GMT time is now
-			 * computable as mysec - locsec.
-			 */
-			delta1 = mysec - locsec;
-
-			/*
-			 * However, if that GMT time and the local time we are actually
-			 * interested in are on opposite sides of a daylight-savings-time
-			 * transition, then this is not the time offset we want.  So,
-			 * adjust the time_t to be what we think the GMT time
-			 * corresponding to our target local time is, and repeat the
-			 * localtime() call and delta calculation.	We may have to do it
-			 * twice before we have a trustworthy delta.
-			 *
-			 * Note: think not to put a loop here, since if we've been given
-			 * an "impossible" local time (in the gap during a spring-forward
-			 * transition) we'd never get out of the loop. Twice is enough to
-			 * give the behavior we want, which is that "impossible" times are
-			 * taken as standard time, while at a fall-back boundary ambiguous
-			 * times are also taken as standard.
-			 */
-			mysec += delta1;
-			mytime = (time_t) mysec;
-			tmp = localtime(&mytime);
-			if (!tmp)
-			{
-				tm->tm_isdst = 0;
-				return 0;
-			}
-			day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
-				   date2j(1970, 1, 1));
-			locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
-			delta2 = mysec - locsec;
-			if (delta2 != delta1)
-			{
-				mysec += (delta2 - delta1);
-				mytime = (time_t) mysec;
-				tmp = localtime(&mytime);
-				if (!tmp)
-				{
-					tm->tm_isdst = 0;
-					return 0;
-				}
-				day = (date2j(tmp->tm_year + 1900, tmp->tm_mon + 1, tmp->tm_mday) -
-					   date2j(1970, 1, 1));
-				locsec = tmp->tm_sec + (tmp->tm_min + (day * HOURS_PER_DAY + tmp->tm_hour) * MINS_PER_HOUR) * SECS_PER_MINUTE;
-				delta2 = mysec - locsec;
-			}
-			tm->tm_isdst = tmp->tm_isdst;
-			tz = (int) delta2;
-		}
-#else							/* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
-		/* Assume UTC if no system timezone info available */
-		tm->tm_isdst = 0;
-		tz = 0;
-#endif
-	}
-	else
-	{
-		/* Given date is out of range, so assume UTC */
-		tm->tm_isdst = 0;
-		tz = 0;
-	}
-
-	return tz;
-}
-
 static void
 dt2time(double jd, int *hour, int *min, int *sec, fsec_t *fsec)
 {