News for the tz database

Release 2022a - 2022-03-15 23:02:01 -0700

  Briefly:
    Palestine will spring forward on 2022-03-27, not -03-26.
    zdump -v now outputs better failure indications.
    Bug fixes for code that reads corrupted TZif data.

  Changes to future timestamps

    Palestine will spring forward on 2022-03-27, not 2022-03-26.
    (Thanks to Heba Hamad.)  Predict future transitions for first
    Sunday >= March 25.  Additionally, predict fallbacks to be the first
    Friday on or after October 23, not October's last Friday, to be more
    consistent with recent practice.  The first differing fallback
    prediction is on 2025-10-24, not 2025-10-31.

  Changes to past timestamps

    From 1992 through spring 1996, Ukraine's DST transitions were at
    02:00 standard time, not at 01:00 UTC.  (Thanks to Alois Treindl.)

    Chile's Santiago Mean Time and its LMT precursor have been adjusted
    eastward by 1 second to align with past and present law.

  Changes to commentary

    Add several references for Chile's 1946/1947 transitions, some of
    which only affected portions of the country.

  Changes to code

    Fix bug when mktime gets confused by truncated TZif files with
    unspecified local time.  (Problem reported by Almaz Mingaleev.)

    Fix bug when 32-bit time_t code reads malformed 64-bit TZif data.
    (Problem reported by Christos Zoulas.)

    When reading a version 2 or later TZif file, the TZif reader now
    validates the version 1 header and data block only enough to skip
    over them, as recommended by RFC 8536 section 4.  Also, the TZif
    reader no longer mistakenly attempts to parse a version 1 TZIf
    file header as a TZ string.

    zdump -v now outputs "(localtime failed)" and "(gmtime failed)"
    when local time and UT cannot be determined for a timestamp.

  Changes to build procedure

    Distribution tarballs now use standard POSIX.1-1988 ustar format
    instead of GNU format.  Although the formats are almost identical
    for these tarballs, ustar headers' mag                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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