Time Zone Database Release 2018c
Released
Downloads
| File | Description |
|---|---|
 tzdb-2018c.tar.lz (416.3kb) |
Complete Distribution (Data, Code and Extras) |
| tzdata2018c.tar.gz (333.1kb) |
Data Only Distribution |
| tzcode2018c.tar.gz (218.6kb) |
Code Only Distribution |
Release Notes
Briefly:
Revert Irish changes that relied on negative SAVE values.
Changes to tm_isdst
Revert the 2018a change to Europe/Dublin. As before, this change
does not affect UT offsets or abbreviations; it affects only
whether timestamps are considered to be standard time or
daylight-saving time, as expressed in the tm_isdst flag of C's
struct tm type. This reversion is intended to be a temporary
workaround for problems discovered with downstream uses of
releases 2018a and 2018b, which implemented Irish time by using
negative SAVE values in the Eire rules of the 'europe' file.
Although negative SAVE values have been part of tzcode for many
years and are supported by many platforms, they were not
documented before 2018a and ICU and OpenJDK do not currently
support them. A mechanism to export data to platforms lacking
support for negative DST is planned to be developed before the
change is reapplied. (Problems reported by Deborah Goldsmith and
Stephen Colebourne.)
Changes to past timestamps
Japanese DST transitions (1948-1951) were Sundays at 00:00, not
Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
Changes to build procedure
The build procedure now works around mawk 1.3.3's lack of support
for character class expressions. (Problem reported by Ohyama.)