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Re: [MacPerl] time, date, and timezone
MacPerler's,
Timezones?
Don't be too simplistic.
Don't forget there there are timezones which are not integer hours
offset from GMT (I recall India is +6 1/2 hours off of GMT or +5 1/2
from London DST).
(If you don't believe me, bring up APPLE->Control Panels->Map,
type in 'London' and then 'Calcutta'.)
>>> Since it's in Windows, it must be a bad idea 1/2 :-).
>>
>>Or it means that occasionally Windows does steal good ideas :-)
>
>Was this still about a $TZ environment var. ? It is NOT in Windows! It
>would be nice if it were, though. It's in the registry, but under different
>keys in Win95 and NT !!
>
>Windows does occasionnaly have/steal (who cares) good ideas, but this
>doesn't look like one... :-)
And apparently Microsoft, typically, is not consistent in its
appropriation of the Good Things of the universe.
>Ah, and there's another problem: sometimes the $TZ will not be numeric but
>text, and possibly ambiguous: BST should be Brazil Standard, but is
>sometimes used for British Summer, and others like this...
TZ is complicated enough, and different enough on the various systems
that do use it, that maybe MacPerl shouldn't mess with it.
from SunOS 5.5.1> man -s 5 environ ...
TZ Timezone information. The contents of this
environment variable are used by the functions
ctime(3C), localtime(3C), strftime(3C), and
mktime(3C) to override the default timezone. If
TZ is not in the following form, it designates a
path to a timezone database file relative to
/usr/share/lib/zoneinfo/, ignoring the first
character if it is a colon (:); otherwise, TZ
has the form:
stdoffset[dst[offset],[start[/time],end[/time]]]
std and dst Three or more bytes that are the
designation for the standard (std)
and daylight savings time (dst)
timezones. Only std is required. If
dst is missing, then daylight sav-
ings time does not apply in this
locale. Upper- and lower-case
letters are allowed. Any characters
except a leading colon (:), digits,
a comma (,), a minus (-) or a plus
(+) are allowed.
offset Indicates the value one must add to
the local time to arrive at Coordi-
nated Universal Time. The offset
has the form:
hh[:mm[:ss]]
The minutes (mm) and seconds (ss)
are optional. The hour (hh) is
required and may be a single digit.
The offset following std is
required. If no offset follows dst
, daylight savings time is assumed
to be one hour ahead of standard
time. One or more digits may be
used; the value is always inter-
preted as a decimal number. The
hour must be between 0 and 24, and
the minutes (and seconds) if present
between 0 and 59. Out of range
values may cause unpredictable
behavior. If preceded by a ``-'',
the timezone is east of the Prime
Meridian; otherwise it is west
(which may be indicated by an
optional preceding ``+'' sign).
start/time,end/time
Indicate when to change to and back
from daylight savings time, where
start/time describes when the change
from standard time to daylight sav-
ings time occurs, and end/time
describes when the change back hap-
pens. Each time field describes
when, in current local time, the
change is made.
The formats of start and end are one
of the following:
Jn The Julian day n (1 < n <
365). Leap days are not
counted. That is, in all
years, February 28 is day
59 and March 1 is day 60.
It is impossible to refer
to the occasional February
n The zero-based Julian day
(0 < n < 365). Leap days
are counted, and it is
possible to refer to
February 29.
Mm.n.d The dth day, (0 < d < 6)
of week n of month m of
the year (1 < n < 5, 1 < m
< 12), where week 5 means
``the last d-day in month
m'' which may occur in
either the fourth or the
fifth week). Week 1 is
the first week in which
the dth day occurs. Day
zero is Sunday.
Implementation specific defaults are
used for start and end if these
optional fields are not given.
The time has the same format as
offset except that no leading sign
(``-'' or ``+'') is allowed. The
default, if time is not given is
02:00:00.
... end quote from man -s 5 environ
--
Regards, Larry F. Allen-Tonar (larryat@cts.com) +1 760/746-6464 (voice)
Principal Designer +1 760/746-0766 (FAX,
P.O. Box 463072 upon request)
Escondido, CA 92046-3072
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