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authornijtmans <nijtmans>2008-12-12 17:42:52 (GMT)
committernijtmans <nijtmans>2008-12-12 17:42:52 (GMT)
commit5e59751a50b0e27533ef93600fe6c7e84d6e25bf (patch)
tree7fef5dd4f4fe6f6cf70cb3d9c6d6ac2a1dff7dde
parent6dfd3f4dec3ab26eb1ed5f12080e1c803946ea32 (diff)
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Document new DST fallback rules.
Fix time change in Eastern Europe (not 3:00 but 4:00 local time) [Bug 2207436]
-rw-r--r--ChangeLog8
-rw-r--r--doc/clock.n17
-rw-r--r--library/clock.tcl6
3 files changed, 27 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog
index 51f4989..796d294 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2008-12-12 Jan Nijtmans <nijtmans@users.sf.net>
+
+ * doc/clock.n: Document new DST fallback rules.
+ * library/clock.tcl (ProcessPosixTimeZone): Fix time change
+ in Eastern Europe (not 3:00 but 4:00 local time) [Bug 2207436]
+
2008-12-12 Donal K. Fellows <dkf@users.sf.net>
* generic/tclZlib.c, unix/configure.in: Added stubs to use when the
@@ -62,7 +68,7 @@
* library/clock.tcl (ProcessPosixTimeZone): Fallback to European time
zone DST rules, when the timezone is between 0 and -12. [Bug 2207436]
- * tests/clock.test (clock-64.[12]): Test cases for [Bug 2207436]
+ * tests/clock.test (clock-52.[23]): Test cases for [Bug 2207436]
2008-12-11 Donal K. Fellows <dkf@users.sf.net>
diff --git a/doc/clock.n b/doc/clock.n
index 60042be..f4c3805 100644
--- a/doc/clock.n
+++ b/doc/clock.n
@@ -805,6 +805,23 @@ environment variable will be recognized. The specification
may be found at
\fIhttp://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html\fR.
.PP
+If the Posix time zone string contains a DST (Daylight Savings Time)
+part, but doesn't contain a rule stating when DST starts or ends,
+then default rules are used. For Timezones with an offset between 0
+and +12, the current European/Russian rules are used, otherwise the
+current US rules are used. In Europe (offset +0 to +2) the switch
+to summertime is done each last Sunday in March at 1:00 GMT, and
+the switch back is each last Sunday in October at 2:00 GMT. In
+Russia (offset +3 to +12), the switch dates are the same, only
+the switch to summertime is at 2:00 local time, and the switch
+back is at 3:00 local time in all time zones. The US switch to
+summertime takes place each second Sunday in March at 2:00 local
+time, and the switch back is each first Sunday in November at
+3:00 local time. These default rules mean that in all European,
+Russian and US (or compatible) time zones, DST calculations will
+be correct for dates in 2007 and later, unless in the future the
+rules change again.
+.PP
Any other time zone string is processed by prefixing a colon and attempting
to use it as a location name, as above.
.SH "LOCALIZATION"
diff --git a/library/clock.tcl b/library/clock.tcl
index bfac4e6..d972955 100644
--- a/library/clock.tcl
+++ b/library/clock.tcl
@@ -13,7 +13,7 @@
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
-# RCS: @(#) $Id: clock.tcl,v 1.50 2008/12/11 14:01:59 nijtmans Exp $
+# RCS: @(#) $Id: clock.tcl,v 1.51 2008/12/12 17:42:52 nijtmans Exp $
#
#----------------------------------------------------------------------
@@ -3891,7 +3891,7 @@ proc ::tcl::clock::ProcessPosixTimeZone { z } {
&& [dict get $z startMonth] eq {} } {
if {($stdHours>=0) && ($stdHours<=12)} {
dict set z startWeekOfMonth 5
- if {$stdHours>1} {
+ if {$stdHours>2} {
dict set z startHours 2
} else {
dict set z startHours [expr {$stdHours+1}]
@@ -3910,7 +3910,7 @@ proc ::tcl::clock::ProcessPosixTimeZone { z } {
if {($stdHours>=0) && ($stdHours<=12)} {
dict set z endMonth 10
dict set z endWeekOfMonth 5
- if {$stdHours>1} {
+ if {$stdHours>2} {
dict set z endHours 3
} else {
dict set z endHours [expr {$stdHours+2}]