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SCCS-file: Theory
SCCS-SID: 4.2
This commit is contained in:
Arthur David Olson
1989-02-27 10:06:31 -05:00
committed by Paul Eggert
parent 35da1e2d91
commit 1c3ac45831
1 changed files with 10 additions and 16 deletions
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Theory
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@ -37,13 +37,14 @@ the usefulness of the SVR2 functions:
These are the changes that have been made to the SVR2 functions:
* The "TZ" environment variable is used in generating the name of a file
from which time zone information is read; "TZ" is no longer constrained
to be a three-letter time zone name followed by a number of hours and
an optional three-letter daylight time zone name. The daylight saving
time rules to be used for a particular time zone are encoded in the
time zone file; the format of the file allows U.S., Australian, and
other rules to be encoded, and allows for situations where more than
two time zone abbreviations are used.
from which time zone information is read (or is interpreted a la
POSIX); "TZ" is no longer constrained to be a three-letter time zone
name followed by a number of hours and an optional three-letter
daylight time zone name. The daylight saving time rules to be used
for a particular time zone are encoded in the time zone file;
the format of the file allows U.S., Australian, and other rules to be
encoded, and allows for situations where more than two time zone
abbreviations are used.
It was recognized that allowing the "TZ" environment variable to
take on values such as "US/Eastern" might cause "old" programs
@ -54,8 +55,8 @@ These are the changes that have been made to the SVR2 functions:
to continue using "TZ": it is widely used for time zone purposes;
separately maintaining both "TZ" and "TIMEZONE" seemed a nuisance;
and systems where "new" forms of "TZ" might cause problems can simply
give time zone files names such as "EST5EDT" which can be used both by
"new" programs (as file names) and "old" programs (as zone names and
use TZ values such as "EST5EDT" which can be used both by
"new" programs (a la POSIX) and "old" programs (as zone names and
offsets).
* To handle places where more than two time zone abbreviations are used,
@ -124,10 +125,3 @@ functions. Rather, their absence reflects the decision to make this package
close to SVR2 (with the exceptions outlined above) to ensure its broad
acceptability. If more powerful time conversion functions can be standardized,
so much the better.
It's probably not wise to standardize everything in this package.
While the command
nroff -man newctime.3
produces a document that describes this package, the command
nroff -man -rX3J11 newctime.3
produces a document that describes the "standardizable" parts.