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Fix to_date() and to_timestamp() to allow specification of the day of

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the week via ISO or Gregorian designations.  The fix is to store the
day-of-week consistently as 1-7, Sunday = 1.

Fixes bug reported by Marc Munro
This commit is contained in:
Bruce Momjian 2012-09-03 22:52:34 -04:00
parent e442b0f0c6
commit 015722fb36
3 changed files with 16 additions and 8 deletions
src
backend/utils/adt
formatting.ctimestamp.c
include/utils
timestamp.h

10
src/backend/utils/adt/formatting.c

@ -412,7 +412,7 @@ typedef struct
mi,
ss,
ssss,
d,
d, /* stored as 1-7, Sunday = 1, 0 means missing */
dd,
ddd,
mm,
@ -2897,6 +2897,7 @@ DCH_from_char(FormatNode *node, char *in, TmFromChar *out)
from_char_seq_search(&value, &s, days, ONE_UPPER,
MAX_DAY_LEN, n);
from_char_set_int(&out->d, value, n);
out->d++;
break;
case DCH_DY:
case DCH_Dy:
@ -2904,6 +2905,7 @@ DCH_from_char(FormatNode *node, char *in, TmFromChar *out)
from_char_seq_search(&value, &s, days, ONE_UPPER,
MAX_DY_LEN, n);
from_char_set_int(&out->d, value, n);
out->d++;
break;
case DCH_DDD:
from_char_parse_int(&out->ddd, &s, n);
@ -2919,11 +2921,13 @@ DCH_from_char(FormatNode *node, char *in, TmFromChar *out)
break;
case DCH_D:
from_char_parse_int(&out->d, &s, n);
out->d--;
s += SKIP_THth(n->suffix);
break;
case DCH_ID:
from_char_parse_int_len(&out->d, &s, 1, n);
/* Shift numbering to match Gregorian where Sunday = 1 */
if (++out->d > 7)
out->d = 1;
s += SKIP_THth(n->suffix);
break;
case DCH_WW:
@ -3534,7 +3538,7 @@ do_to_timestamp(text *date_txt, text *fmt,
if (tmfc.w)
tmfc.dd = (tmfc.w - 1) * 7 + 1;
if (tmfc.d)
tm->tm_wday = tmfc.d;
tm->tm_wday = tmfc.d - 1; /* convert to native numbering */
if (tmfc.dd)
tm->tm_mday = tmfc.dd;
if (tmfc.ddd)

12
src/backend/utils/adt/timestamp.c

@ -3775,18 +3775,22 @@ isoweek2date(int woy, int *year, int *mon, int *mday)
/* isoweekdate2date()
*
* Convert an ISO 8601 week date (ISO year, ISO week and day of week) into a Gregorian date.
* Convert an ISO 8601 week date (ISO year, ISO week) into a Gregorian date.
* Gregorian day of week sent so weekday strings can be supplied.
* Populates year, mon, and mday with the correct Gregorian values.
* year must be passed in as the ISO year.
*/
void
isoweekdate2date(int isoweek, int isowday, int *year, int *mon, int *mday)
isoweekdate2date(int isoweek, int wday, int *year, int *mon, int *mday)
{
int jday;
jday = isoweek2j(*year, isoweek);
jday += isowday - 1;
/* convert Gregorian week start (Sunday=1) to ISO week start (Monday=1) */
if (wday > 1)
jday += wday - 2;
else
jday += 6;
j2date(jday, year, mon, mday);
}

2
src/include/utils/timestamp.h

@ -236,7 +236,7 @@ extern int timestamp_cmp_internal(Timestamp dt1, Timestamp dt2);
extern int isoweek2j(int year, int week);
extern void isoweek2date(int woy, int *year, int *mon, int *mday);
extern void isoweekdate2date(int isoweek, int isowday, int *year, int *mon, int *mday);
extern void isoweekdate2date(int isoweek, int wday, int *year, int *mon, int *mday);
extern int date2isoweek(int year, int mon, int mday);
extern int date2isoyear(int year, int mon, int mday);
extern int date2isoyearday(int year, int mon, int mday);