mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
89 lines
3.7 KiB
Plaintext
89 lines
3.7 KiB
Plaintext
@(#)README 8.3
|
|
This file is in the public domain, so clarified as of
|
|
2009-05-17 by Arthur David Olson.
|
|
|
|
$FreeBSD$
|
|
|
|
"What time is it?" -- Richard Deacon as The King
|
|
"Any time you want it to be." -- Frank Baxter as The Scientist
|
|
(from the Bell System film "About Time")
|
|
|
|
The 1989 update of the time zone package featured
|
|
|
|
* POSIXization (including interpretation of POSIX-style TZ environment
|
|
variables, provided by Guy Harris),
|
|
* ANSIfication (including versions of "mktime" and "difftime"),
|
|
* SVIDulation (an "altzone" variable)
|
|
* MACHination (the "gtime" function)
|
|
* corrections to some time zone data (including corrections to the rules
|
|
for Great Britain and New Zealand)
|
|
* reference data from the United States Naval Observatory for folks who
|
|
want to do additional time zones
|
|
* and the 1989 data for Saudi Arabia.
|
|
|
|
(Since this code will be treated as "part of the implementation" in some places
|
|
and as "part of the application" in others, there's no good way to name
|
|
functions, such as timegm, that are not part of the proposed ANSI C standard;
|
|
such functions have kept their old, underscore-free names in this update.)
|
|
|
|
And the "dysize" function has disappeared; it was present to allow compilation
|
|
of the "date" command on old BSD systems, and a version of "date" is now
|
|
provided in the package. The "date" command is not created when you "make all"
|
|
since it may lack options provided by the version distributed with your
|
|
operating system, or may not interact with the system in the same way the
|
|
native version does.
|
|
|
|
Since POSIX frowns on correct leap second handling, the default behavior of
|
|
the "zic" command (in the absence of a "-L" option) has been changed to omit
|
|
leap second information from its output files.
|
|
|
|
Here is a recipe for acquiring, building, installing, and testing the
|
|
tz distribution on a GNU/Linux or similar host.
|
|
|
|
mkdir tz
|
|
cd tz
|
|
wget 'ftp://elsie.nci.nih.gov/pub/tz*.tar.gz'
|
|
gzip -dc tzcode*.tar.gz | tar -xf -
|
|
gzip -dc tzdata*.tar.gz | tar -xf -
|
|
|
|
Be sure to read the comments in "Makefile" and make any changes needed
|
|
to make things right for your system, especially if you are using some
|
|
platform other than GNU/Linux. Then run the following commands,
|
|
substituting your desired installation directory for "$HOME/tzdir":
|
|
|
|
make TOPDIR=$HOME/tzdir install
|
|
$HOME/tzdir/etc/zdump -v America/Los_Angeles
|
|
|
|
To use the new functions, use a "-ltz" option when compiling or linking.
|
|
|
|
Historical local time information has been included here to:
|
|
|
|
* provide a compendium of data about the history of civil time
|
|
that is useful even if the data are not 100% accurate;
|
|
|
|
* give an idea of the variety of local time rules that have
|
|
existed in the past and thus an idea of the variety that may be
|
|
expected in the future;
|
|
|
|
* provide a test of the generality of the local time rule description
|
|
system.
|
|
|
|
The information in the time zone data files is by no means authoritative;
|
|
the files currently do not even attempt to cover all time stamps before
|
|
1970, and there are undoubtedly errors even for time stamps since 1970.
|
|
If you know that the rules are different from those in a file, by all means
|
|
feel free to change file (and please send the changed version to
|
|
tz@elsie.nci.nih.gov for use in the future). Europeans take note!
|
|
|
|
Thanks to these Timezone Caballeros who've made major contributions to the
|
|
time conversion package: Keith Bostic; Bob Devine; Paul Eggert; Robert Elz;
|
|
Guy Harris; Mark Horton; John Mackin; and Bradley White. Thanks also to
|
|
Michael Bloom, Art Neilson, Stephen Prince, John Sovereign, and Frank Wales
|
|
for testing work, and to Gwillim Law for checking local mean time data.
|
|
None of them are responsible for remaining errors.
|
|
|
|
Look in the ~ftp/pub directory of elsie.nci.nih.gov
|
|
for updated versions of these files.
|
|
|
|
Please send comments or information to tz@elsie.nci.nih.gov.
|