Attachment #7207 for bug #15968

Lines 1-5 Link Here

(-)a/ChangeLog (+9 lines)
1	2013-09-18 Paul Eggert <eggert@cs.ucla.edu>	1	2013-09-18 Paul Eggert <eggert@cs.ucla.edu>
2		2
		3	Support TZ transition times < 00:00:00.
		4	This is needed for version-3 tz-format files; it supports time
		5	stamps past 2037 for America/Godthab (the only entry in the tz
		6	database for which this change is relevant).
		7	* manual/time.texi (TZ Variable): Document transition times
		8	from -167:59:59 through -00:00:01.
		9	* time/tzset.c (tz_rule): Time of day is now signed.
		10	(__tzset_parse_tz): Parse negative time of day.
		11
3	Document TZ transition times >= 25:00:00.	12	Document TZ transition times >= 25:00:00.
4	* manual/time.texi (TZ Variable): Document transition times from	13	* manual/time.texi (TZ Variable): Document transition times from
5	25:00:00 through 167:59:59. These are already supported, and this	14	25:00:00 through 167:59:59. These are already supported, and this




The @var{time} fields specify when, in the local time currently in
effect, the change to the other time occurs.  If omitted, the default is
@code{02:00:00}.  The hours part of the time fields can range from
@minus{}167 through 167; this is an extension to POSIX.1, which allows
only the range 0 through 24.

Here are some example @code{TZ} values, including the appropriate

WART4WARST,J1/0,J365/25
@end smallexample

Western Greenland Time (WGT) and Western Greenland Summer Time (WGST)
are 3 hours behind UTC in the winter.  Its clocks follow the European
Union rules of springing forward by one hour on March's last Sunday at
01:00 UTC (@minus{}02:00 local time) and falling back on October's
last Sunday at 01:00 UTC (@minus{}01:00 local time).

@smallexample
WGT3WGST,M3.5.0/-2,M10.5.0/-1
@end smallexample

The schedule of Daylight Saving Time in any particular jurisdiction has
changed over the years.  To be strictly correct, the conversion of dates
and times in the past should be based on the schedule that was in effect

Lines 54-60 typedef struct Link Here

(-)a/time/tzset.c (-3 / +5 lines)
54	/* When to change. */	54	/* When to change. */
55	enum { J0, J1, M } type; /* Interpretation of: */	55	enum { J0, J1, M } type; /* Interpretation of: */
56	unsigned short int m, n, d; /* Month, week, day. */	56	unsigned short int m, n, d; /* Month, week, day. */
57	unsigned int secs; /* Time of day. */	57	int secs; /* Time of day. */
58		58
59	long int offset; /* Seconds east of GMT (west if < 0). */	59	long int offset; /* Seconds east of GMT (west if < 0). */
60		60
Lines 362-370 __tzset_parse_tz (tz) Link Here
362	else if (*tz == '/')	362	else if (*tz == '/')
363	{	363	{
364	/* Get the time of day of the change. */	364	/* Get the time of day of the change. */
		365	int negative;
365	++tz;	366	++tz;
366	if (*tz == '\0')	367	if (*tz == '\0')
367	goto out;	368	goto out;
		369	negative = *tz == '-';
		370	tz += negative;
368	consumed = 0;	371	consumed = 0;
369	switch (sscanf (tz, "%hu%n:%hu%n:%hu%n",	372	switch (sscanf (tz, "%hu%n:%hu%n:%hu%n",
370	&hh, &consumed, &mm, &consumed, &ss, &consumed))	373	&hh, &consumed, &mm, &consumed, &ss, &consumed))
Lines 379-385 __tzset_parse_tz (tz) Link Here
379	break;	382	break;
380	}	383	}
381	tz += consumed;	384	tz += consumed;
382	tzr->secs = (hh * 60 * 60) + (mm * 60) + ss;	385	tzr->secs = (negative ? -1 : 1) * ((hh * 60 * 60) + (mm * 60) + ss);
383	}	386	}
384	else	387	else
385	/* Default to 2:00 AM. */	388	/* Default to 2:00 AM. */
386	-

Return to bug 15968

Lines 2083-2089 between @code{1} and @code{12}. Link Here

(-)a/manual/time.texi (-1 / +11 lines)
2083	The @var{time} fields specify when, in the local time currently in	2083	The @var{time} fields specify when, in the local time currently in
2084	effect, the change to the other time occurs. If omitted, the default is	2084	effect, the change to the other time occurs. If omitted, the default is
2085	@code{02:00:00}. The hours part of the time fields can range from	2085	@code{02:00:00}. The hours part of the time fields can range from
2086	0 through 167; this is an extension to POSIX.1, which allows	2086	@minus{}167 through 167; this is an extension to POSIX.1, which allows
2087	only the range 0 through 24.	2087	only the range 0 through 24.
2088		2088
2089	Here are some example @code{TZ} values, including the appropriate	2089	Here are some example @code{TZ} values, including the appropriate
Lines 2119-2124 is a placeholder. Link Here
2119	WART4WARST,J1/0,J365/25	2119	WART4WARST,J1/0,J365/25
2120	@end smallexample	2120	@end smallexample
2121		2121
		2122	Western Greenland Time (WGT) and Western Greenland Summer Time (WGST)
		2123	are 3 hours behind UTC in the winter. Its clocks follow the European
		2124	Union rules of springing forward by one hour on March's last Sunday at
		2125	01:00 UTC (@minus{}02:00 local time) and falling back on October's
		2126	last Sunday at 01:00 UTC (@minus{}01:00 local time).
		2127
		2128	@smallexample
		2129	WGT3WGST,M3.5.0/-2,M10.5.0/-1
		2130	@end smallexample
		2131
2122	The schedule of Daylight Saving Time in any particular jurisdiction has	2132	The schedule of Daylight Saving Time in any particular jurisdiction has
2123	changed over the years. To be strictly correct, the conversion of dates	2133	changed over the years. To be strictly correct, the conversion of dates
2124	and times in the past should be based on the schedule that was in effect	2134	and times in the past should be based on the schedule that was in effect