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[Paul Eggert]

On 5/20/20 4:32 AM, Sundar Sarma wrote:
> The above test case according to your update (will not fall back on 
> 2020-11-01) is correct. But test case is failing.

My guess is that you didn't propagate the data into Java. Java doesn't 
use tzdata's TZif files directly; it builds and installs its own copy of 
the files and uses that. If Java's copy is obsolete then Java programs 
will report obsolete results. For more about this see 
<https://data.iana.org/time-zones/tz-link.html> and look for "Oracle Java".

You can test this by running the shell command:

zdump -v -c 2020,2021 America/Dawson

If older tzdata is installed you'll see this:

$ zdump -v -c 2020,2022 America/Dawson
America/Dawson  -9223372036854775808 = NULL
America/Dawson  -9223372036854689408 = NULL
America/Dawson  Sun Mar  8 09:59:59 2020 UTC = Sun Mar  8 01:59:59 2020 
PST isdst=0 gmtoff=-28800
America/Dawson  Sun Mar  8 10:00:00 2020 UTC = Sun Mar  8 03:00:00 2020 
PDT isdst=1 gmtoff=-25200
America/Dawson  Sun Nov  1 08:59:59 2020 UTC = Sun Nov  1 01:59:59 2020 
PDT isdst=1 gmtoff=-25200
America/Dawson  Sun Nov  1 09:00:00 2020 UTC = Sun Nov  1 01:00:00 2020 
PST isdst=0 gmtoff=-28800
America/Dawson  Sun Mar 14 09:59:59 2021 UTC = Sun Mar 14 01:59:59 2021 
PST isdst=0 gmtoff=-28800
America/Dawson  Sun Mar 14 10:00:00 2021 UTC = Sun Mar 14 03:00:00 2021 
PDT isdst=1 gmtoff=-25200
America/Dawson  Sun Nov  7 08:59:59 2021 UTC = Sun Nov  7 01:59:59 2021 
PDT isdst=1 gmtoff=-25200
America/Dawson  Sun Nov  7 09:00:00 2021 UTC = Sun Nov  7 01:00:00 2021 
PST isdst=0 gmtoff=-28800
America/Dawson  9223372036854689407 = NULL
America/Dawson  9223372036854775807 = NULL

with transitions continuing this fall and next year. In tzdata 2020a 
you'll see this:

$ zdump -v -c 2020,2022 America/Dawson
America/Dawson  -9223372036854775808 = NULL
America/Dawson  -9223372036854689408 = NULL
America/Dawson  Sun Mar  8 09:59:59 2020 UT = Sun Mar  8 01:59:59 2020 
PST isdst=0 gmtoff=-28800
America/Dawson  Sun Mar  8 10:00:00 2020 UT = Sun Mar  8 03:00:00 2020 
MST isdst=0 gmtoff=-25200
America/Dawson  9223372036854689407 = NULL
America/Dawson  9223372036854775807 = NULL

with transitions stopping after March of this year, and Yukon observing 
MST now. If you see the latter output then your tzdata is up-to-date; if 
Java is reporting incorrect results in this area then the problem has 
something to do with the Java installation, which is downstream from us.