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ICU-23296 Update tzdata to 2025c #46

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Merged
eggrobin merged 2 commits into from
Dec 18, 2025
Merged

ICU-23296 Update tzdata to 2025c #46

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af8187b
ICU-23296 Pick up CLDR changes since 2025b
eggrobin Dec 15, 2025
4d901cc
ICU-23296 Add 2025c data
eggrobin Dec 15, 2025
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Binary file added tzdata/icunew/2025c/44/be/metaZones.res
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4,588 changes: 4,588 additions & 0 deletions tzdata/icunew/2025c/44/metaZones.txt
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135 changes: 102 additions & 33 deletions tzdata/supplemental/metaZones.txt
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@robertbastian robertbastian Dec 17, 2025

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these are changes from CLDR 48, did we miss a step during integration?

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@eggrobin eggrobin Dec 17, 2025

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The same kind of drive-by picking up of CLDR changes seems to have happened in #34, so it’s not clear that this has consistently been an integration step. But perhaps it should be.

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@robertbastian robertbastian Dec 17, 2025

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Ah is this only patch data? So ICU 78 shipped with a TZDB 2025b, and clients didn't use the 2025b data from this repo?

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@eggrobin eggrobin Dec 17, 2025

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I think so, but I cannot say I am familiar with the architecture here. @markusicu, do you know who uses this (apart from us as part of the process of picking up a new TZDB for unicode-org/icu)?

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@markusicu markusicu Dec 17, 2025

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Users of ICU need to be able to update the time zone data without having to update ICU, so for many years we have published the data here.

See https://unicode-org.github.io/icu/userguide/datetime/timezone/#updating-the-time-zone-data

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@markusicu markusicu Dec 17, 2025

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these are changes from CLDR 48, did we miss a step during integration?

The last update was for 2025b, done by @Yqwed in #45 in 2025-apr. I guess we only update this file in this repo when there is a new tzdata version, not whenever CLDR changes.

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@eggrobin eggrobin Dec 19, 2025

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I guess we only update this file in this repo when there is a new tzdata version, not whenever CLDR changes.

Should we update it when CLDR changes? (This seems like the same misalignment in process that led to the comprehensive round-trip tests failing: the timezone update process isn’t followed when we update CLDR’s timezone-related data.)

Original file line number Diff line number Diff line change
Expand Up @@ -379,9 +379,12 @@ metaZones:table(nofallback){
Guyana{
001{"America/Guyana"}
}
Hawaii_Aleutian{
Hawaii{
001{"Pacific/Honolulu"}
}
Hawaii_Aleutian{
001{"America/Adak"}
}
Hong_Kong{
001{"Asia/Hong_Kong"}
}
Expand Down Expand Up @@ -776,6 +779,7 @@ metaZones:table(nofallback){
haal{"Hawaii_Aleutian"}
hoko{"Hong_Kong"}
hovd{"Hovd"}
hwai{"Hawaii"}
ince{"Indonesia_Central"}
indi{"India"}
indo{"Indochina"}
Expand Down Expand Up @@ -1149,11 +1153,11 @@ metaZones:table(nofallback){
{
"Liberia",
"1970-01-01 00:00",
"1972-05-01 00:45",
"1972-01-07 00:45",
}
{
"GMT",
"1972-05-01 00:45",
"1972-01-07 00:45",
"9999-12-31 23:59",
}
}
Expand Down Expand Up @@ -1709,7 +1713,7 @@ metaZones:table(nofallback){
{
"Chile",
"1970-01-01 00:00",
"2025-03-19 21:00",
"2025-03-20 03:00",
}
}
"America:Creston"{
Expand Down Expand Up @@ -2804,7 +2808,7 @@ metaZones:table(nofallback){
{
"Chile",
"1982-05-01 03:00",
"2016-12-03 23:00",
"2016-12-04 03:00",
}
}
"Antarctica:Rothera"{
Expand Down Expand Up @@ -2870,11 +2874,11 @@ metaZones:table(nofallback){
{
"Magadan",
"2010-03-27 14:00",
"2014-10-25 14:00",
"2011-03-26 15:00",
}
{
"Anadyr",
"2014-10-25 14:00",
"Kamchatka",
"2011-03-26 15:00",
"9999-12-31 23:59",
}
}
Expand Down Expand Up @@ -2926,11 +2930,11 @@ metaZones:table(nofallback){
{
"Ashkhabad",
"1970-01-01 00:00",
"1991-10-26 20:00",
"1992-01-18 22:00",
}
{
"Turkmenistan",
"1991-10-26 20:00",
"1992-01-18 22:00",
"9999-12-31 23:59",
}
}
Expand Down Expand Up @@ -2967,11 +2971,11 @@ metaZones:table(nofallback){
{
"Baku",
"1970-01-01 00:00",
"1991-08-29 20:00",
"1991-03-30 22:00",
}
{
"Azerbaijan",
"1991-08-29 20:00",
"1991-03-30 22:00",
"9999-12-31 23:59",
}
}
Expand All @@ -2980,6 +2984,13 @@ metaZones:table(nofallback){
"Indochina",
}
}
"Asia:Barnaul"{
{
"Krasnoyarsk",
"2016-03-26 20:00",
"9999-12-31 23:59",
}
}
"Asia:Beirut"{
{
"Europe_Eastern",
Expand All @@ -2989,11 +3000,11 @@ metaZones:table(nofallback){
{
"Frunze",
"1970-01-01 00:00",
"1991-08-30 20:00",
"1991-03-30 20:00",
}
{
"Kyrgystan",
"1991-08-30 20:00",
"1991-03-30 20:00",
"9999-12-31 23:59",
}
}
Expand All @@ -3015,7 +3026,7 @@ metaZones:table(nofallback){
}
{
"Irkutsk",
"2014-10-25 16:00",
"2014-10-25 17:00",
"2016-03-26 18:00",
}
{
Expand Down Expand Up @@ -3100,6 +3111,11 @@ metaZones:table(nofallback){
"1970-01-01 00:00",
"2016-09-07 21:00",
}
{
"Europe_Eastern",
"2017-10-29 01:00",
"9999-12-31 23:59",
}
}
"Asia:Gaza"{
{
Expand Down Expand Up @@ -3290,6 +3306,13 @@ metaZones:table(nofallback){
"Asia:Novosibirsk"{
{
"Novosibirsk",
"1970-01-01 00:00",
"2016-07-23 20:00",
}
{
"Krasnoyarsk",
"2016-07-23 20:00",
"9999-12-31 23:59",
}
}
"Asia:Omsk"{
Expand Down Expand Up @@ -3424,6 +3447,18 @@ metaZones:table(nofallback){
"Asia:Sakhalin"{
{
"Sakhalin",
"1970-01-01 00:00",
"2014-10-25 15:00",
}
{
"Magadan",
"2014-10-25 15:00",
"2016-03-26 16:00",
}
{
"Magadan",
"2016-04-26 16:00",
"9999-12-31 23:59",
}
}
"Asia:Samarkand"{
Expand Down Expand Up @@ -3469,6 +3504,11 @@ metaZones:table(nofallback){
"1970-01-01 00:00",
"2014-10-25 14:00",
}
{
"Magadan",
"2016-04-23 16:00",
"9999-12-31 23:59",
}
}
"Asia:Taipei"{
{
Expand All @@ -3479,23 +3519,23 @@ metaZones:table(nofallback){
{
"Tashkent",
"1970-01-01 00:00",
"1991-08-31 18:00",
"1991-03-30 20:00",
}
{
"Uzbekistan",
"1991-08-31 18:00",
"1991-03-30 20:00",
"9999-12-31 23:59",
}
}
"Asia:Tbilisi"{
{
"Tbilisi",
"1970-01-01 00:00",
"1991-04-08 20:00",
"1991-03-30 22:00",
}
{
"Georgia",
"1991-04-08 20:00",
"1991-03-30 22:00",
"9999-12-31 23:59",
}
}
Expand All @@ -3521,6 +3561,13 @@ metaZones:table(nofallback){
"Japan",
}
}
"Asia:Tomsk"{
{
"Krasnoyarsk",
"2016-05-28 20:00",
"9999-12-31 23:59",
}
}
"Asia:Ulaanbaatar"{
{
"Mongolia",
Expand Down Expand Up @@ -3579,11 +3626,11 @@ metaZones:table(nofallback){
{
"Yerevan",
"1970-01-01 00:00",
"1991-09-22 20:00",
"1991-03-30 22:00",
}
{
"Armenia",
"1991-09-22 20:00",
"1991-03-30 22:00",
"9999-12-31 23:59",
}
}
Expand Down Expand Up @@ -3732,6 +3779,11 @@ metaZones:table(nofallback){
"1992-03-28 22:00",
"2016-03-26 23:00",
}
{
"Samara",
"2016-03-26 23:00",
"9999-12-31 23:59",
}
}
"Europe:Athens"{
{
Expand Down Expand Up @@ -3777,11 +3829,11 @@ metaZones:table(nofallback){
{
"Moscow",
"1970-01-01 00:00",
"1990-05-05 21:00",
"1990-05-05 22:00",
}
{
"Europe_Eastern",
"1990-05-05 21:00",
"1990-05-05 22:00",
"9999-12-31 23:59",
}
}
Expand Down Expand Up @@ -3845,11 +3897,11 @@ metaZones:table(nofallback){
{
"Turkey",
"1978-06-28 21:00",
"1985-04-19 21:00",
"1984-10-31 23:00",
}
{
"Europe_Eastern",
"1985-04-19 21:00",
"1984-10-31 23:00",
"2016-09-06 21:00",
}
{
Expand Down Expand Up @@ -3904,6 +3956,13 @@ metaZones:table(nofallback){
"9999-12-31 23:59",
}
}
"Europe:Kirov"{
{
"Moscow",
"2014-10-25 22:00",
"9999-12-31 23:59",
}
}
"Europe:Lisbon"{
{
"Europe_Central",
Expand Down Expand Up @@ -4082,6 +4141,11 @@ metaZones:table(nofallback){
"1992-03-28 22:00",
"2016-12-03 23:00",
}
{
"Samara",
"2016-12-03 23:00",
"9999-12-31 23:59",
}
}
"Europe:Simferopol"{
{
Expand Down Expand Up @@ -4148,6 +4212,11 @@ metaZones:table(nofallback){
"1992-01-19 00:00",
"2016-03-26 23:00",
}
{
"Samara",
"2016-03-26 23:00",
"9999-12-31 23:59",
}
}
"Europe:Vaduz"{
{
Expand Down Expand Up @@ -4189,6 +4258,13 @@ metaZones:table(nofallback){
"Europe:Volgograd"{
{
"Volgograd",
"1970-01-01 00:00",
"2020-12-26 22:00",
}
{
"Moscow",
"2020-12-26 22:00",
"9999-12-31 23:59",
}
}
"Europe:Warsaw"{
Expand Down Expand Up @@ -4349,14 +4425,7 @@ metaZones:table(nofallback){
}
"Pacific:Honolulu"{
{
"Alaska_Hawaii",
"1970-01-01 00:00",
"1983-10-30 11:00",
}
{
"Hawaii_Aleutian",
"1983-10-30 11:00",
"9999-12-31 23:59",
"Hawaii",
}
}
"Pacific:Kiritimati"{
Expand Down