Update tzdata to 2023a

Author: pganssle

NEWS.md

@@ -1,3 +1,59 @@
+# Version 2023.1
+Upstream version 2023a released 2023-03-22T19:39:33+00:00
+
+## Briefly:
+
+Egypt now uses DST again, from April through October. This year Morocco springs
+forward April 23, not April 30. Palestine delays the start of DST this year.
+Much of Greenland still uses DST from 2024 on. America/Yellowknife now links to
+America/Edmonton. tzselect can now use current time to help infer timezone. The
+code now defaults to C99 or later. Fix use of C23 attributes.
+
+## Changes to future timestamps
+
+Starting in 2023, Egypt will observe DST from April's last Friday through
+October's last Thursday.  (Thanks to Ahmad ElDardiry.) Assume the transition
+times are 00:00 and 24:00, respectively.
+
+In 2023 Morocco's spring-forward transition after Ramadan will occur April 23,
+not April 30.  (Thanks to Milamber.) Adjust predictions for future years
+accordingly.  This affects predictions for 2023, 2031, 2038, and later years.
+
+This year Palestine will delay its spring forward from March 25 to April 29 due
+to Ramadan.  (Thanks to Heba Hamad.) Make guesses for future Ramadans too.
+
+Much of Greenland, represented by America/Nuuk, will continue to observe DST
+using European Union rules.  When combined with Greenland's decision not to
+change the clocks in fall 2023, America/Nuuk therefore changes from -03/-02 to
+-02/-01 effective 2023-10-29 at 01:00 UTC.  (Thanks to Thomas M. Steenholdt.)
+This change from 2022g doesn't affect timestamps until 2024-03-30, and doesn't
+affect tm_isdst until 2023-03-25.
+
+## Changes to past timestamps
+
+America/Yellowknife has changed from a Zone to a backward compatibility Link, as
+it no longer differs from America/Edmonton since 1970.  (Thanks to Almaz
+Mingaleev.)  This affects some pre-1948 timestamps.  The old data are now in
+'backzone'.
+
+## Changes to past time zone abbreviations
+
+When observing Moscow time, Europe/Kirov and Europe/Volgograd now use the
+abbreviations MSK/MSD instead of numeric abbreviations, for consistency with
+other timezones observing Moscow time.
+
+## Changes to commentary
+
+tz-link.html has a new section "Coordinating with governments and distributors".
+(Thanks to Neil Fuller for some of the text.)
+
+To improve tzselect diagnostics, zone1970.tab's comments column is now limited
+to countries that have multiple timezones.
+
+Note that leap seconds are planned to be discontinued by 2035.
+
+---
+
 # Version 2022.7
 Upstream version 2022g released 2022-11-29T16:58:31+00:00
 

VERSION

@@ -1 +1 @@
-2022.7
+2023.1

news.d/2023a.md

@@ -0,0 +1,53 @@
+# Version 2023.1
+Upstream version 2023a released 2023-03-22T19:39:33+00:00
+
+## Briefly:
+
+Egypt now uses DST again, from April through October. This year Morocco springs
+forward April 23, not April 30. Palestine delays the start of DST this year.
+Much of Greenland still uses DST from 2024 on. America/Yellowknife now links to
+America/Edmonton. tzselect can now use current time to help infer timezone. The
+code now defaults to C99 or later. Fix use of C23 attributes.
+
+## Changes to future timestamps
+
+Starting in 2023, Egypt will observe DST from April's last Friday through
+October's last Thursday.  (Thanks to Ahmad ElDardiry.) Assume the transition
+times are 00:00 and 24:00, respectively.
+
+In 2023 Morocco's spring-forward transition after Ramadan will occur April 23,
+not April 30.  (Thanks to Milamber.) Adjust predictions for future years
+accordingly.  This affects predictions for 2023, 2031, 2038, and later years.
+
+This year Palestine will delay its spring forward from March 25 to April 29 due
+to Ramadan.  (Thanks to Heba Hamad.) Make guesses for future Ramadans too.
+
+Much of Greenland, represented by America/Nuuk, will continue to observe DST
+using European Union rules.  When combined with Greenland's decision not to
+change the clocks in fall 2023, America/Nuuk therefore changes from -03/-02 to
+-02/-01 effective 2023-10-29 at 01:00 UTC.  (Thanks to Thomas M. Steenholdt.)
+This change from 2022g doesn't affect timestamps until 2024-03-30, and doesn't
+affect tm_isdst until 2023-03-25.
+
+## Changes to past timestamps
+
+America/Yellowknife has changed from a Zone to a backward compatibility Link, as
+it no longer differs from America/Edmonton since 1970.  (Thanks to Almaz
+Mingaleev.)  This affects some pre-1948 timestamps.  The old data are now in
+'backzone'.
+
+## Changes to past time zone abbreviations
+
+When observing Moscow time, Europe/Kirov and Europe/Volgograd now use the
+abbreviations MSK/MSD instead of numeric abbreviations, for consistency with
+other timezones observing Moscow time.
+
+## Changes to commentary
+
+tz-link.html has a new section "Coordinating with governments and distributors".
+(Thanks to Neil Fuller for some of the text.)
+
+To improve tzselect diagnostics, zone1970.tab's comments column is now limited
+to countries that have multiple timezones.
+
+Note that leap seconds are planned to be discontinued by 2035.

src/tzdata/__init__.py

@@ -1,6 +1,6 @@
 # IANA versions like 2020a are not valid PEP 440 identifiers; the recommended
 # way to translate the version is to use YYYY.n where `n` is a 0-based index.
-__version__ = "2022.7"
+__version__ = "2023.1"
 
 # This exposes the original IANA version number.
-IANA_VERSION = "2022g"
+IANA_VERSION = "2023a"