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Commita286f73

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The following patches eliminate the overflows in the j2date() and date2j()
functions which limited the maximum date for a timestamp to AD 1465001.The new limit is AD 5874897.The files affected are:doc/src/sgml/datatype.sgml: Documentation change due to patch. Included is a notice about the reduced range when using an eight-byte integer for timestamps.src/backend/utils/adt/datetime.c: Replacement functions for j2date() and date2j() functions.src/include/utils/datetime.h: Corrected a bug with the limit on the earliest possible date, Nov 23,-4713 has a Julian day count of -1. The earliest possible date should be Nov 24, -4713 with a day count of 0.src/test/regress/expected/horology-no-DST-before-1970.out:src/test/regress/expected/horology-solaris-1947.out:src/test/regress/expected/horology.out: Copies of expected output for regression testing. Note: Only horology.out has been physically tested. I do not have access to a Solaris box and I don't know how to provoke the "pre-1970" test.src/test/regress/sql/horology.sql: Added some test cases to check extended range.John Cochran
1 parent4efbbd7 commita286f73

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7 files changed

+132
-44
lines changed

7 files changed

+132
-44
lines changed

‎doc/src/sgml/datatype.sgml

Lines changed: 5 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
<!--
2-
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.113 2003/01/31 01:08:07 tgl Exp $
2+
$Header: /cvsroot/pgsql/doc/src/sgml/datatype.sgml,v 1.114 2003/02/19 03:48:10 momjian Exp $
33
-->
44

55
<chapter id="datatype">
@@ -1243,15 +1243,15 @@ SELECT b, char_length(b) FROM test2;
12431243
<entry>both date and time</entry>
12441244
<entry>8 bytes</entry>
12451245
<entry>4713 BC</entry>
1246-
<entry>AD1465001</entry>
1246+
<entry>AD5874897</entry>
12471247
<entry>1 microsecond / 14 digits</entry>
12481248
</row>
12491249
<row>
12501250
<entry><type>timestamp [ (<replaceable>p</replaceable>) ] with time zone</type></entry>
12511251
<entry>both date and time</entry>
12521252
<entry>8 bytes</entry>
12531253
<entry>4713 BC</entry>
1254-
<entry>AD1465001</entry>
1254+
<entry>AD5874897</entry>
12551255
<entry>1 microsecond / 14 digits</entry>
12561256
</row>
12571257
<row>
@@ -1309,7 +1309,8 @@ SELECT b, char_length(b) FROM test2;
13091309
a few years of 2000-01-01, but the precision degrades for dates further
13101310
away. When timestamps are stored as eight-byte integers (a compile-time
13111311
option), microsecond precision is available over the full range of
1312-
values.
1312+
values. However eight-byte integer timestamps have a reduced range of
1313+
dates from 4713 BC up to 294276 AD.
13131314
</para>
13141315
</note>
13151316

‎src/backend/utils/adt/datetime.c

Lines changed: 49 additions & 38 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.99 2003/01/29 01:08:42 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.100 2003/02/19 03:48:10 momjian Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -587,66 +587,77 @@ static datetkn *deltacache[MAXDATEFIELDS] = {NULL};
587587
*since it is numerically accurate and computationally simple.
588588
* The algorithms here will accurately convert between Julian day
589589
*and calendar date for all non-negative Julian days
590-
*(i.e. from Nov 23, -4713 on).
591-
*
592-
* Ref: Explanatory Supplement to the Astronomical Almanac, 1992.
593-
*University Science Books, 20 Edgehill Rd. Mill Valley CA 94941.
594-
*
595-
* Use the algorithm by Henry Fliegel, a former NASA/JPL colleague
596-
*now at Aerospace Corp. (hi, Henry!)
590+
*(i.e. from Nov 24, -4713 on).
597591
*
598592
* These routines will be used by other date/time packages
599593
* - thomas 97/02/25
594+
*
595+
* Rewritten to eliminate overflow problems. This now allows the
596+
* routines to work correctly for all Julian day counts from
597+
* 0 to 2147483647 (Nov 24, -4713 to Jun 3, 5874898) assuming
598+
* a 32-bit integer. Longer types should also work to the limits
599+
* of their precision.
600600
*/
601601

602602
int
603603
date2j(inty,intm,intd)
604604
{
605-
intm12= (m-14) /12;
605+
intjulian;
606+
intcentury;
607+
608+
if (m>2) {
609+
m+=1;
610+
y+=4800;
611+
}else {
612+
m+=13;
613+
y+=4799;
614+
}
615+
616+
century=y/100;
617+
julian=y*365-32167;
618+
julian+=y/4-century+century/4;
619+
julian+=7834*m/256+d;
606620

607-
return ((1461* (y+4800+m12)) /4
608-
+ (367* (m-2-12* (m12))) /12
609-
- (3* ((y+4900+m12) /100)) /4
610-
+d-32075);
621+
returnjulian;
611622
}/* date2j() */
612623

613624
void
614625
j2date(intjd,int*year,int*month,int*day)
615626
{
616-
intj,
617-
y,
618-
m,
619-
d;
627+
unsignedintjulian;
628+
unsignedintquad;
629+
unsignedintextra;
630+
inty;
631+
632+
julian=jd;
633+
julian+=32044;
634+
quad=julian/146097;
635+
extra= (julian-quad*146097)*4+3;
636+
julian+=60+quad*3+extra/146097;
637+
quad=julian/1461;
638+
julian-=quad*1461;
639+
y=julian*4 /1461;
640+
julian= ((y!=0) ? ((julian+305) %365) : ((julian+306) %366))
641+
+123;
642+
y+=quad*4;
643+
*year=y-4800;
644+
quad=julian*2141 /65536;
645+
*day=julian-7834*quad/256;
646+
*month= (quad+10) %12+1;
620647

621-
inti,
622-
l,
623-
n;
624-
625-
l=jd+68569;
626-
n= (4*l) /146097;
627-
l-= (146097*n+3) /4;
628-
i= (4000* (l+1)) /1461001;
629-
l+=31- (1461*i) /4;
630-
j= (80*l) /2447;
631-
d=l- (2447*j) /80;
632-
l=j /11;
633-
m= (j+2)- (12*l);
634-
y=100* (n-49)+i+l;
635-
636-
*year=y;
637-
*month=m;
638-
*day=d;
639648
return;
640649
}/* j2date() */
641650

642651
int
643652
j2day(intdate)
644653
{
645-
intday;
654+
unsignedintday;
646655

647-
day= (date+1) %7;
656+
day=date;
657+
day+=1;
658+
day %=7;
648659

649-
returnday;
660+
return(int)day;
650661
}/* j2day() */
651662

652663

‎src/include/utils/datetime.h

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
1010
* Portions Copyright (c) 1994, Regents of the University of California
1111
*
12-
* $Id: datetime.h,v 1.34 2003/01/16 00:26:49 tgl Exp $
12+
* $Id: datetime.h,v 1.35 2003/02/19 03:48:10 momjian Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -239,7 +239,7 @@ extern intday_tab[2][13];
239239

240240
#defineJULIAN_MINYEAR (-4713)
241241
#defineJULIAN_MINMONTH (11)
242-
#defineJULIAN_MINDAY (23)
242+
#defineJULIAN_MINDAY (24)
243243

244244
#defineIS_VALID_JULIAN(y,m,d) (((y) > JULIAN_MINYEAR) \
245245
|| (((y) == JULIAN_MINYEAR) && (((m) > JULIAN_MINMONTH) \

‎src/test/regress/expected/horology-no-DST-before-1970.out

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -328,6 +328,30 @@ SELECT timestamp without time zone '1999-12-01' + interval '1 month - 1 second'
328328
Fri Dec 31 23:59:59 1999
329329
(1 row)
330330

331+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
332+
Nov 27, 2733194
333+
-----------------------------
334+
Sun Nov 27 00:00:00 2733194
335+
(1 row)
336+
337+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
338+
Nov 30, 5471101
339+
-----------------------------
340+
Sat Nov 30 00:00:00 5471101
341+
(1 row)
342+
343+
SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
344+
Dec 31, 5874897
345+
-----------------------------
346+
Tue Dec 31 00:00:00 5874897
347+
(1 row)
348+
349+
SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
350+
2147483493 Days
351+
-------------------
352+
@ 2147483493 days
353+
(1 row)
354+
331355
-- Shorthand values
332356
-- Not directly usable for regression testing since these are not constants.
333357
-- So, just try to test parser and hope for the best - thomas 97/04/26

‎src/test/regress/expected/horology-solaris-1947.out

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -328,6 +328,30 @@ SELECT timestamp without time zone '1999-12-01' + interval '1 month - 1 second'
328328
Fri Dec 31 23:59:59 1999
329329
(1 row)
330330

331+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
332+
Nov 27, 2733194
333+
-----------------------------
334+
Sun Nov 27 00:00:00 2733194
335+
(1 row)
336+
337+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
338+
Nov 30, 5471101
339+
-----------------------------
340+
Sat Nov 30 00:00:00 5471101
341+
(1 row)
342+
343+
SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
344+
Dec 31, 5874897
345+
-----------------------------
346+
Tue Dec 31 00:00:00 5874897
347+
(1 row)
348+
349+
SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
350+
2147483493 Days
351+
-------------------
352+
@ 2147483493 days
353+
(1 row)
354+
331355
-- Shorthand values
332356
-- Not directly usable for regression testing since these are not constants.
333357
-- So, just try to test parser and hope for the best - thomas 97/04/26

‎src/test/regress/expected/horology.out

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -328,6 +328,30 @@ SELECT timestamp without time zone '1999-12-01' + interval '1 month - 1 second'
328328
Fri Dec 31 23:59:59 1999
329329
(1 row)
330330

331+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '1000000000 days' AS "Nov 27, 2733194";
332+
Nov 27, 2733194
333+
-----------------------------
334+
Sun Nov 27 00:00:00 2733194
335+
(1 row)
336+
337+
SELECT timestamp without time zone 'Nov 24, 4714 BC' + interval '2000000000 days' AS "Nov 30, 5471101";
338+
Nov 30, 5471101
339+
-----------------------------
340+
Sat Nov 30 00:00:00 5471101
341+
(1 row)
342+
343+
SELECT timestamp without time zone 'Nov 25, 4714 BC' + interval '2147483492 days' AS "Dec 31, 5874897";
344+
Dec 31, 5874897
345+
-----------------------------
346+
Tue Dec 31 00:00:00 5874897
347+
(1 row)
348+
349+
SELECT timestamp without time zone '12/31/5874897' - timestamp without time zone 'Nov 24, 4714 BC' AS "2147483493 Days";
350+
2147483493 Days
351+
-------------------
352+
@ 2147483493 days
353+
(1 row)
354+
331355
-- Shorthand values
332356
-- Not directly usable for regression testing since these are not constants.
333357
-- So, just try to test parser and hope for the best - thomas 97/04/26

‎src/test/regress/sql/horology.sql

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -76,6 +76,10 @@ SELECT timestamp without time zone '1996-03-01' - interval '1 second' AS "Feb 29
7676
SELECTtimestamp without time zone'1999-03-01'- interval'1 second'AS"Feb 28";
7777
SELECTtimestamp without time zone'2000-03-01'- interval'1 second'AS"Feb 29";
7878
SELECTtimestamp without time zone'1999-12-01'+ interval'1 month - 1 second'AS"Dec 31";
79+
SELECTtimestamp without time zone'Nov 24, 4714 BC'+ interval'1000000000 days'AS"Nov 27, 2733194";
80+
SELECTtimestamp without time zone'Nov 24, 4714 BC'+ interval'2000000000 days'AS"Nov 30, 5471101";
81+
SELECTtimestamp without time zone'Nov 25, 4714 BC'+ interval'2147483492 days'AS"Dec 31, 5874897";
82+
SELECTtimestamp without time zone'12/31/5874897'-timestamp without time zone'Nov 24, 4714 BC'AS"2147483493 Days";
7983

8084
-- Shorthand values
8185
-- Not directly usable for regression testing since these are not constants.

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