tree d6b6100d52a743bec9c1eb6ccc2b833e3e9ce27b
parent 146cb611fb2c1f53e63c2e59bd735d7a8ac6ec8c
author Frank Tang <ftang@chromium.org> 1602612668 -0700
committer Frank Tang <ftang@chromium.org> 1602614820 +0000

Update IANA timezone db to 2020b

https://mm.icann.org/pipermail/tz-announce/2020-October/000059.html
     Revised predictions for Morocco's changes starting in 2023.
     Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
     Macquarie Island has stayed in sync with Tasmania since 2011.
     Casey, Antarctica is at +08 in winter and +11 in summer.
     zic no longer supports -y, nor the TYPE field of Rules.

The tz-related files are updated by running update_tz.sh and ICU
data files are rebuilt.

Either in JS console in Chrome or v8 should work like these:
// a) Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
df1 = new Intl.DateTimeFormat("en", {timeZone: "America/Dawson", timeStyle: "long", dateStyle: "long"})
d1 = new Date("2020-03-09T00:00:00.000Z")
df1.format(d1)

Before change
"March 8, 2020 at 5:00:00 PM MST"

After change
"March 8, 2020 at 5:00:00 PM PDT"

Notice "This change affects only the time zone abbreviation (MST vs PDT)
and daylight saving flag for the period between the two dates."

// b) Casey Station, Antarctica  using +08 in winter and +11 in summer since 2018.
df2 = new Intl.DateTimeFormat("en", {timeZone: "Antarctica/Casey", timeStyle: "long", dateStyle: "long"})
d2 = new Date("2020-10-04T00:00:00.000Z")
df2.format(d2)

Before change
"October 4, 2020 at 8:00:00 AM GMT+8"

After change
"October 4, 2020 at 11:00:00 AM GMT+11"

// c) Macquarie Island in sync with Tasmania since 2011.
df3 = new Intl.DateTimeFormat("en", {timeZone: "Antarctica/Macquarie", timeStyle: "long", dateStyle: "long"})

d3 = new Date("2020-04-05T00:00:00.000Z")
df3.format(d3)

Before change
"April 5, 2020 at 11:00:00 AM GMT+11"

After change
"April 5, 2020 at 10:00:00 AM GMT+10"

Bug: chromium:1137864
Change-Id: Ic924fb49c8acdfeb24822c7282adff21b6ffbdd9
TBR=jshin@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/2468440
Reviewed-by: Frank Tang <ftang@chromium.org>