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54 lines
2.3 KiB
Plaintext
54 lines
2.3 KiB
Plaintext
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This 1989 update of the time zone package features
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* POSIXization (including interpretation of POSIX-style TZ environment
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variables, provided by Guy Harris),
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* ANSIfication (including versions of "mktime" and "difftime"),
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* SVIDulation (an "altzone" variable)
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* MACHination (the "gtime" function)
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* corrections to some time zone data (including corrections to the rules
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for Great Britain and New Zealand)
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* reference data from the United States Naval Observatory for folks who
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want to do additional time zones
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* and the 1989 data for Saudi Arabia.
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(Since this code will be treated as "part of the implementation" in some places
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and as "part of the application" in others, there's no good way to name
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functions, such as timegm, that are not part of the proposed ANSI C standard;
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such functions have kept their old, underscore-free names in this update.)
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Support for the tz_abbr variable has been eliminated from this version
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(to forestall "kitchen sink" complaints from certain quarters :-).
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Since POSIX frowns on correct leap second handling, the default behavior of
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the "zic" command (in the absence of a "-L" option) has been changed to omit
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leap second information from its output files.
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Please send comments or information to ado@ncifcrf.gov.
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Be sure to read the comments in "Makefile" and make any changes
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needed to make things right for your system.
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To use the new functions, use a "-lz" option when compiling or linking.
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Historical local time information has been included here not because it
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is particularly useful, but rather to:
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* give an idea of the variety of local time rules that have
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existed in the past and thus an idea of the variety that may be
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expected in the future;
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* provide a test of the generality of the local time rule description
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system.
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The information in the time zone data files is by no means authoritative;
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if you know that the rules are different from those in a file, by all means
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feel free to change file (and please send the changed version to
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ado@ncifcrf.gov for use in the future). Europeans take note!
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Thanks to these Timezone Caballeros who've made major contributions to the
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time conversion package: Keith Bostic; Bob Devine; Robert Elz; Guy Harris;
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Mark Horton; John Mackin; and Bradley White. None of them are responsible for
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remaining errors.
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