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Arrange to install a "posixrules" entry in our timezone database, so that

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POSIX-style timezone specs that don't exactly match any database entry will
be treated as having correct USA DST rules.  Also, document that this can
be changed if you want to use some other DST rules with a POSIX zone spec.

We could consider changing localtime.c's TZDEFRULESTRING, but since that
facility can only deal with one DST transition rule, it seems fairly useless
now; might as well just plan to override it using a "posixrules" entry.

Backpatch as far as 8.0.  There isn't much we can do in 7.x ... either your
libc gets it right, or it doesn't.
This commit is contained in:
Tom Lane 2007-03-14 17:38:15 +00:00
parent 8a7b38617a
commit 1a72f357e3
2 changed files with 22 additions and 9 deletions
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23
doc/src/sgml/datatype.sgml
View File

@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.181.2.1 2007/01/30 22:29:40 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.181.2.2 2007/03/14 17:38:15 tgl Exp $ -->
<chapter id="datatype">
<title id="datatype-title">Data Types</title>
@ -2194,12 +2194,13 @@ January 8 04:05:06 1999 PST
were not already a recognized zone name, it would be accepted and would
be functionally equivalent to USA East Coast time. When a
daylight-savings zone name is present, it is assumed to be used
according to USA time zone rules, so this feature is of limited use
outside North America. One should also be wary that this provision can
lead to silently accepting bogus input, since there is no check on the
reasonableness of the zone abbreviations. For example, <literal>SET
TIMEZONE TO FOOBAR0</> will work, leaving the system effectively using
a rather peculiar abbreviation for GMT.
according to the same daylight-savings transition rules used in the
<literal>zic</> time zone database's <filename>posixrules</> entry.
In a standard <productname>PostgreSQL</productname> installation,
<filename>posixrules</> is the same as <literal>US/Eastern</>, so
that POSIX-style time zone specifications follow USA daylight-savings
rules. If needed, you can adjust this behavior by replacing the
<filename>posixrules</> file.
</para>
</listitem>
</itemizedlist>
@ -2210,6 +2211,14 @@ January 8 04:05:06 1999 PST
rule and so have two possible UTC offsets.
</para>
<para>
One should be wary that the POSIX-style time zone feature can
lead to silently accepting bogus input, since there is no check on the
reasonableness of the zone abbreviations. For example, <literal>SET
TIMEZONE TO FOOBAR0</> will work, leaving the system effectively using
a rather peculiar abbreviation for UTC.
</para>
<para>
In all cases, timezone names are recognized case-insensitively.
(This is a change from <productname>PostgreSQL</productname> versions

8
src/timezone/Makefile
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@ -4,7 +4,7 @@
# Makefile for the timezone library
# IDENTIFICATION
# $PostgreSQL: pgsql/src/timezone/Makefile,v 1.24 2006/07/25 03:51:22 tgl Exp $
# $PostgreSQL: pgsql/src/timezone/Makefile,v 1.24.2.1 2007/03/14 17:38:15 tgl Exp $
#
#-------------------------------------------------------------------------
@ -25,6 +25,10 @@ TZDATA := africa antarctica asia australasia europe northamerica southamerica \
pacificnew etcetera factory backward systemv solar87 solar88 solar89
TZDATAFILES := $(TZDATA:%=$(srcdir)/data/%)
# which zone should determine the DST rules (not the specific UTC offset!)
# for POSIX-style timezone specs
POSIXRULES = US/Eastern
all: SUBSYS.o submake-libpgport zic
SUBSYS.o: $(OBJS)
@ -34,7 +38,7 @@ zic: $(ZICOBJS)
$(CC) $(CFLAGS) $(ZICOBJS) $(LDFLAGS) $(LIBS) -o $@$(X)
install: all installdirs
./zic -d '$(DESTDIR)$(datadir)/timezone' $(TZDATAFILES)
./zic -d '$(DESTDIR)$(datadir)/timezone' -p '$(POSIXRULES)' $(TZDATAFILES)
$(MAKE) -C tznames $@
installdirs: