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Apply date patch from tiemann@cygnus.com,Michael Tiemann.

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This commit is contained in:
Bruce Momjian 1997-03-02 02:05:33 +00:00
parent 162c2a6e4c
commit 3ce0236c69
1 changed files with 37 additions and 15 deletions
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52
src/backend/utils/adt/datetimes.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/datetimes.c,v 1.8 1997/01/26 15:31:12 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/Attic/datetimes.c,v 1.9 1997/03/02 02:05:33 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -240,32 +240,54 @@ date_smaller(int4 dateVal1, int4 dateVal2)
int32
date_mi(int4 dateVal1, int4 dateVal2)
{
int4 dv1, dv2;
DateADT *date1, *date2;
int32 days = 0;
int i;
date1 = (DateADT *) &dateVal1;
date2 = (DateADT *) &dateVal2;
/* This circumlocution allows us to assume that date1 is always
before date2. */
dv1 = date_smaller (dateVal1, dateVal2);
dv2 = date_larger (dateVal1, dateVal2);
date1 = (DateADT *) &dv1;
date2 = (DateADT *) &dv2;
/* Sum number of days in each full year between date1 and date2. */
for (i = date1->year + 1; i < date2->year; ++i)
days += isleap (i) ? 366 : 365;
/* Add in number of days in each full month from date1 to end of
year. */
for (i = date1->month + 1; i <= 12; ++i)
days += day_tab[isleap (date1->year)][i - 1];
if (days)
{
/* We need to wrap around the year. Add in number of days in each
full month from date1 to end of year. */
for (i = date1->month + 1; i <= 12; ++i)
days += day_tab[isleap (date1->year)][i - 1];
/* Add in number of days in each full month from start of year to
date2. */
for (i = 1; i < date2->month; ++i)
days += day_tab[isleap (date2->year)][i - 1];
/* Add in number of days in each full month from start of year to
date2. */
for (i = 1; i < date2->month; ++i)
days += day_tab[isleap (date2->year)][i - 1];
}
else
{
/* Add in number of days in each full month from date1 to date2. */
for (i = date1->month + 1; i < date2->month; ++i)
days += day_tab[isleap (date1->year)][i - 1];
}
/* Add in number of days left in month for date1. */
days += day_tab[isleap (date1->year)][date1->month - 1] - date1->day;
if (days || date1->month != date2->month)
{
/* Add in number of days left in month for date1. */
days += day_tab[isleap (date1->year)][date1->month - 1] - date1->day;
/* Add in day of month of date2. */
days += date2->day;
/* Add in day of month of date2. */
days += date2->day;
}
else
{
/* Everything's in the same month, so just subtract the days! */
days = date2->day - date1->day;
}
return (days);
}