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Commit877f08d

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Fix up timetz input so that a date is required only when the specified
timezone actually has a daylight-savings rule. This avoids breakingcases that used to work because they went through the DecodePosixTimezonecode path. Per contrib regression failures (mea culpa for not runningthose yesterday...). Also document the already-applied change to allowGMT offsets up to 14 hours.
1 parent723f716 commit877f08d

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5 files changed

+77
-26
lines changed

5 files changed

+77
-26
lines changed

‎doc/src/sgml/datatype.sgml‎

Lines changed: 7 additions & 16 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.178 2006/10/17 21:03:20 tgl Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.179 2006/10/18 16:43:13 tgl Exp $ -->
22

33
<chapter id="datatype">
44
<title id="datatype-title">Data Types</title>
@@ -1356,8 +1356,8 @@ SELECT b, char_length(b) FROM test2;
13561356
<entry><type>time [ (<replaceable>p</replaceable>) ] with time zone</type></entry>
13571357
<entry>12 bytes</entry>
13581358
<entry>times of day only, with time zone</entry>
1359-
<entry>00:00:00+1359</entry>
1360-
<entry>24:00:00-1359</entry>
1359+
<entry>00:00:00+1459</entry>
1360+
<entry>24:00:00-1459</entry>
13611361
<entry>1 microsecond / 14 digits</entry>
13621362
</row>
13631363
</tbody>
@@ -1594,7 +1594,8 @@ SELECT b, char_length(b) FROM test2;
15941594
and <xref linkend="datatype-timezone-table">.) If a time zone is
15951595
specified in the input for <type>time without time zone</type>,
15961596
it is silently ignored. You can also specify a date but it will
1597-
be ignored, except when you use a full time zone name like
1597+
be ignored, except when you use a time zone name that involves a
1598+
daylight-savings rule, such as
15981599
<literal>America/New_York</literal>. In this case specifying the date
15991600
is required in order to determine whether standard or daylight-savings
16001601
time applies. The appropriate time zone offset is recorded in the
@@ -1747,12 +1748,7 @@ SELECT b, char_length(b) FROM test2;
17471748
</programlisting>
17481749

17491750
are valid values, which follow the <acronym>ISO</acronym> 8601
1750-
standard. You can also specify the full time zone name as in
1751-
<programlisting>
1752-
1999-01-08 04:05:06 America/New_York
1753-
</programlisting>
1754-
1755-
In addition, the wide-spread format
1751+
standard. In addition, the wide-spread format
17561752
<programlisting>
17571753
January 8 04:05:06 1999 PST
17581754
</programlisting>
@@ -2210,12 +2206,7 @@ January 8 04:05:06 1999 PST
22102206
There is a conceptual and practical difference between the abbreviations
22112207
and the full names: abbreviations always represent a fixed offset from
22122208
UTC, whereas most of the full names imply a local daylight-savings time
2213-
rule and so have two possible UTC offsets. That's why you always have to
2214-
specify a date if you want to use full time zone names in <type>timetz</>
2215-
values. This is also the reason why you should set <xref
2216-
linkend="guc-timezone"> to a full time zone name: this way,
2217-
<productname>PostgreSQL</productname>
2218-
will always know the correct UTC offset for your region.
2209+
rule and so have two possible UTC offsets.
22192210
</para>
22202211

22212212
<para>

‎src/backend/utils/adt/datetime.c‎

Lines changed: 40 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.173 2006/10/17 21:03:21 tgl Exp $
11+
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.174 2006/10/18 16:43:13 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -1199,6 +1199,18 @@ DecodeDateTime(char **field, int *ftype, int nf,
11991199
ptype=val;
12001200
break;
12011201

1202+
caseUNKNOWN_FIELD:
1203+
/*
1204+
* Before giving up and declaring error, check to see
1205+
* if it is an all-alpha timezone name.
1206+
*/
1207+
namedTz=pg_tzset(field[i]);
1208+
if (!namedTz)
1209+
returnDTERR_BAD_FORMAT;
1210+
/* we'll apply the zone setting below */
1211+
tmask=DTK_M(TZ);
1212+
break;
1213+
12021214
default:
12031215
returnDTERR_BAD_FORMAT;
12041216
}
@@ -1911,6 +1923,18 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
19111923
ptype=val;
19121924
break;
19131925

1926+
caseUNKNOWN_FIELD:
1927+
/*
1928+
* Before giving up and declaring error, check to see
1929+
* if it is an all-alpha timezone name.
1930+
*/
1931+
namedTz=pg_tzset(field[i]);
1932+
if (!namedTz)
1933+
returnDTERR_BAD_FORMAT;
1934+
/* we'll apply the zone setting below */
1935+
tmask=DTK_M(TZ);
1936+
break;
1937+
19141938
default:
19151939
returnDTERR_BAD_FORMAT;
19161940
}
@@ -1952,18 +1976,28 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
19521976

19531977
/*
19541978
* If we had a full timezone spec, compute the offset (we could not
1955-
* do it before, because we need the date to resolve DST status).
1979+
* do it before, because wemayneed the date to resolve DST status).
19561980
*/
19571981
if (namedTz!=NULL)
19581982
{
1959-
/* a date has to be specified */
1960-
if ((fmask&DTK_DATE_M)!=DTK_DATE_M)
1961-
returnDTERR_BAD_FORMAT;
1983+
longintgmtoff;
1984+
19621985
/* daylight savings time modifier disallowed with full TZ */
19631986
if (fmask&DTK_M(DTZMOD))
19641987
returnDTERR_BAD_FORMAT;
19651988

1966-
*tzp=DetermineTimeZoneOffset(tm,namedTz);
1989+
/* if non-DST zone, we do not need to know the date */
1990+
if (pg_get_timezone_offset(namedTz,&gmtoff))
1991+
{
1992+
*tzp=-(int)gmtoff;
1993+
}
1994+
else
1995+
{
1996+
/* a date has to be specified */
1997+
if ((fmask&DTK_DATE_M)!=DTK_DATE_M)
1998+
returnDTERR_BAD_FORMAT;
1999+
*tzp=DetermineTimeZoneOffset(tm,namedTz);
2000+
}
19672001
}
19682002

19692003
/* timezone not specified? then find local timezone if possible */

‎src/include/pgtime.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -6,7 +6,7 @@
66
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
77
*
88
* IDENTIFICATION
9-
* $PostgreSQL: pgsql/src/include/pgtime.h,v 1.13 2006/09/16 20:14:33 tgl Exp $
9+
* $PostgreSQL: pgsql/src/include/pgtime.h,v 1.14 2006/10/18 16:43:14 tgl Exp $
1010
*
1111
*-------------------------------------------------------------------------
1212
*/
@@ -55,6 +55,7 @@ extern size_t pg_strftime(char *s, size_t max, const char *format,
5555
externvoidpg_timezone_initialize(void);
5656
externpg_tz*pg_tzset(constchar*tzname);
5757
externbooltz_acceptable(pg_tz*tz);
58+
externboolpg_get_timezone_offset(constpg_tz*tz,longint*gmtoff);
5859
externconstchar*pg_get_timezone_name(pg_tz*tz);
5960

6061
externpg_tzenum*pg_tzenumerate_start(void);

‎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) 1996-2006, PostgreSQL Global Development Group
1010
* Portions Copyright (c) 1994, Regents of the University of California
1111
*
12-
* $PostgreSQL: pgsql/src/include/utils/datetime.h,v 1.61 2006/09/16 20:14:33 tgl Exp $
12+
* $PostgreSQL: pgsql/src/include/utils/datetime.h,v 1.62 2006/10/18 16:43:14 tgl Exp $
1313
*
1414
*-------------------------------------------------------------------------
1515
*/
@@ -176,7 +176,7 @@
176176
#defineDTK_DATE_M(DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY))
177177
#defineDTK_TIME_M(DTK_M(HOUR) | DTK_M(MINUTE) | DTK_M(SECOND))
178178

179-
#defineMAXDATELEN51/* maximum possible length of an input date
179+
#defineMAXDATELEN63/* maximum possible length of an input date
180180
* string (not counting tr. null) */
181181
#defineMAXDATEFIELDS25/* maximum possible number of fields in a date
182182
* string */

‎src/timezone/localtime.c‎

Lines changed: 26 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
* 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
44
*
55
* IDENTIFICATION
6-
* $PostgreSQL: pgsql/src/timezone/localtime.c,v 1.15 2006/10/16 19:58:26 tgl Exp $
6+
* $PostgreSQL: pgsql/src/timezone/localtime.c,v 1.16 2006/10/18 16:43:14 tgl Exp $
77
*/
88

99
/*
@@ -1066,6 +1066,31 @@ pg_next_dst_boundary(const pg_time_t *timep,
10661066
return1;
10671067
}
10681068

1069+
/*
1070+
* If the given timezone uses only one GMT offset, store that offset
1071+
* into *gmtoff and return TRUE, else return FALSE.
1072+
*/
1073+
bool
1074+
pg_get_timezone_offset(constpg_tz*tz,longint*gmtoff)
1075+
{
1076+
/*
1077+
* The zone could have more than one ttinfo, if it's historically used
1078+
* more than one abbreviation. We return TRUE as long as they all have
1079+
* the same gmtoff.
1080+
*/
1081+
conststructstate*sp;
1082+
inti;
1083+
1084+
sp=&tz->state;
1085+
for (i=1;i<sp->typecnt;i++)
1086+
{
1087+
if (sp->ttis[i].tt_gmtoff!=sp->ttis[0].tt_gmtoff)
1088+
return false;
1089+
}
1090+
*gmtoff=sp->ttis[0].tt_gmtoff;
1091+
return true;
1092+
}
1093+
10691094
/*
10701095
* Return the name of the current timezone
10711096
*/

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