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Modify date->timestamp conversion to use mktime().

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This should do better than before around Daylight Savings Time
 transitions.
This commit is contained in:
Thomas G. Lockhart 2000-09-12 05:41:37 +00:00
parent 3bb28381d3
commit 4d745dadc9
2 changed files with 31 additions and 102 deletions
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127
src/backend/utils/adt/date.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.49 2000/07/12 22:59:08 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.50 2000/09/12 05:41:37 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -25,10 +25,6 @@
#include "utils/nabstime.h"
static int date2tm(DateADT dateVal, int *tzp, struct tm * tm,
double *fsec, char **tzn);
/*****************************************************************************
* Date ADT
*****************************************************************************/
@ -230,15 +226,34 @@ date_timestamp(PG_FUNCTION_ARGS)
Timestamp result;
struct tm tt,
*tm = &tt;
int tz;
double fsec = 0;
char *tzn;
time_t utime;
if (date2tm(dateVal, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert date to timestamp");
j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
if (tm2timestamp(tm, fsec, &tz, &result) != 0)
elog(ERROR, "Timestamp out of range");
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
#ifdef USE_POSIX_TIME
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = -1;
tm->tm_year -= 1900;
tm->tm_mon -= 1;
utime = mktime(tm);
if (utime == -1)
elog(ERROR, "Unable to convert date to tm");
result = utime + ((date2j(1970,1,1)-date2j(2000,1,1))*86400.0);
#else /* !USE_POSIX_TIME */
result = dateVal*86400.0+CTimeZone;
#endif
}
else
{
/* Outside of range for timezone support, so assume UTC */
result = dateVal*86400.0;
}
PG_RETURN_TIMESTAMP(result);
}
@ -324,81 +339,6 @@ abstime_date(PG_FUNCTION_ARGS)
}
/* date2tm()
* Convert date to time structure.
* Note that date is an implicit local time, but the system calls assume
* that everything is GMT. So, convert to GMT, rotate to local time,
* and then convert again to try to get the time zones correct.
*/
static int
date2tm(DateADT dateVal, int *tzp, struct tm * tm, double *fsec, char **tzn)
{
struct tm *tx;
time_t utime;
*fsec = 0;
j2date((dateVal + date2j(2000, 1, 1)), &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
tm->tm_hour = 0;
tm->tm_min = 0;
tm->tm_sec = 0;
tm->tm_isdst = -1;
if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
{
/* convert to system time */
utime = ((dateVal + (date2j(2000, 1, 1) - date2j(1970, 1, 1))) * 86400);
/* rotate to noon to get the right day in time zone */
utime += (12 * 60 * 60);
#ifdef USE_POSIX_TIME
tx = localtime(&utime);
tm->tm_year = tx->tm_year + 1900;
tm->tm_mon = tx->tm_mon + 1;
tm->tm_mday = tx->tm_mday;
tm->tm_isdst = tx->tm_isdst;
#if defined(HAVE_TM_ZONE)
tm->tm_gmtoff = tx->tm_gmtoff;
tm->tm_zone = tx->tm_zone;
/* tm_gmtoff is Sun/DEC-ism */
*tzp = -(tm->tm_gmtoff);
if (tzn != NULL)
*tzn = (char *) tm->tm_zone;
#elif defined(HAVE_INT_TIMEZONE)
#ifdef __CYGWIN__
*tzp = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
#else
*tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
#endif
if (tzn != NULL)
*tzn = tzname[(tm->tm_isdst > 0)];
#else
#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
#endif
#else /* !USE_POSIX_TIME */
*tzp = CTimeZone; /* V7 conventions; don't know timezone? */
if (tzn != NULL)
*tzn = CTZName;
#endif
/* otherwise, outside of timezone range so convert to GMT... */
}
else
{
*tzp = 0;
tm->tm_isdst = 0;
if (tzn != NULL)
*tzn = NULL;
}
return 0;
} /* date2tm() */
/*****************************************************************************
* Time ADT
*****************************************************************************/
@ -906,19 +846,8 @@ datetimetz_timestamp(PG_FUNCTION_ARGS)
DateADT date = PG_GETARG_DATEADT(0);
TimeTzADT *time = PG_GETARG_TIMETZADT_P(1);
Timestamp result;
struct tm tt,
*tm = &tt;
int tz;
double fsec = 0;
char *tzn;
if (date2tm(date, &tz, tm, &fsec, &tzn) != 0)
elog(ERROR, "Unable to convert date to timestamp");
if (tm2timestamp(tm, fsec, &time->zone, &result) != 0)
elog(ERROR, "Timestamp out of range");
result += time->time;
result = date*86400.0 + time->time + time->zone;
PG_RETURN_TIMESTAMP(result);
}

6
src/backend/utils/adt/datetime.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.52 2000/07/14 15:33:33 thomas Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.53 2000/09/12 05:41:37 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -2247,8 +2247,8 @@ EncodeTimeSpan(struct tm * tm, double fsec, int style, char *str)
sprintf(cp, "%s%02d:%02d", (is_nonzero ? " " : ""),
abs(tm->tm_hour), abs(tm->tm_min));
cp += strlen(cp);
if ((tm->tm_hour != 0) || (tm->tm_min != 0))
is_nonzero = TRUE;
/* Mark as "non-zero" since the fields are now filled in */
is_nonzero = TRUE;
/* fractional seconds? */
if (fsec != 0)