Dear tzdata maintainers,

I have found that after tzdata2020b release something has gone wrong with Asia/Gaza timezone, which is related to Palestine.

For checking I used this information https://www.timeanddate.com/worldclock/palestine/gaza and

for DST at 2019: https://www.timeanddate.com/time/change/palestine/gaza?year=2019

 for DST at 2020: https://www.timeanddate.com/time/change/palestine/gaza?year=2020

 for DST at 2021: https://www.timeanddate.com/time/change/palestine/gaza?year=2021

I compiled all last release of tzdata from 2019c to 2021a and was comparing them with Ubuntu packages for 2020b on groovy (20.10) and 2021a on bionic (18.04).

If several changes in the date of DST for different years can be related with last applied laws of DST in Palestine (described here http://mm.icann.org/pipermail/tz/2020-October/029376.html), but broken timezone output in letters or numbers is speaking about any error in the this time zone code.

Can you investigate this too ?

On screenshot you can see all my investigation:

Also I share all commands and listing for your execution itself:

[root@Router8:~]# ls -la /etc/localtime

lrwxrwxrwx 1 root root 35 Mar  4  2021 /etc/localtime -> /usr/share/zoneinfo/posix/Asia/Gaza

[root@Router8:~]# ls -la /usr/share/zoneinfo/posix/Asia/Gaza*

lrwxrwxrwx 1 root root   41 Mar 27 01:00 /usr/share/zoneinfo/posix/Asia/Gaza -> /usr/share/zoneinfo/posix/Asia/Gaza.2019c

-rw-r--r-- 1 root root 2316 Oct 22 09:34 /usr/share/zoneinfo/posix/Asia/Gaza.2019c

-rw-r--r-- 1 root root 2316 Oct 30  2020 /usr/share/zoneinfo/posix/Asia/Gaza.2020a

-rw-r--r-- 1 root root 1166 Oct 30  2020 /usr/share/zoneinfo/posix/Asia/Gaza.2020b

-rw-r--r-- 1 root root 1166 Oct 30  2020 /usr/share/zoneinfo/posix/Asia/Gaza.2020c

-rw-r--r-- 1 root root 1195 Oct 30  2020 /usr/share/zoneinfo/posix/Asia/Gaza.2020d

-rw-r--r-- 1 root root 1213 Mar  1  2021 /usr/share/zoneinfo/posix/Asia/Gaza.2021a

-rw-r--r-- 1 root root 2316 Oct 19  2020 /usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2020b

-rw-r--r-- 1 root root 2459 Jan 27  2021 /usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2021a

[root@Router8:~]# date +"%Y%m%d %T" -s "20190328 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20190328 23:59:55

Thu Mar 28 23:59:59 2019        +0200   EET

Fri Mar 29 01:00:01 2019        +0300   EEST

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.2020a /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.2020a'

[root@Router8:~]# date +"%Y%m%d %T" -s "20200326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20200326 23:59:55

Thu Mar 26 23:59:59 2020        +0200   EET

Fri Mar 27 01:00:01 2020        +0300   EEST

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.2020b /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.2020b'

[root@Router8:~]# date +"%Y%m%d %T" -s "20200326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20200326 23:59:55

Thu Mar 26 23:59:59 2020        +0000

Fri Mar 27 00:00:01 2020        +0000

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.2020c /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.2020c'

[root@Router8:~]# date +"%Y%m%d %T" -s "20200326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20200326 23:59:55

Thu Mar 26 23:59:59 2020        +0000

Fri Mar 27 00:00:01 2020        +0000

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2020b /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2020b'

[root@Router8:~]# date +"%Y%m%d %T" -s "20200326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20200326 23:59:55

Thu Mar 26 23:59:59 2020        +0200   EET

Fri Mar 27 01:00:01 2020        +0300   EEST

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.2021a /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.2021a'

[root@Router8:~]# date +"%Y%m%d %T" -s "20210326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20210326 23:59:55

Fri Mar 26 23:59:59 2021        +0000

Sat Mar 27 00:00:01 2021        +0000

[root@Router8:~]# ln -sfv /usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2021a /usr/share/zoneinfo/posix/Asia/Gaza

'/usr/share/zoneinfo/posix/Asia/Gaza' -> '/usr/share/zoneinfo/posix/Asia/Gaza.ubuntu.2021a'

[root@Router8:~]# date +"%Y%m%d %T" -s "20210326 23:59:55" ; sleep 4; date +%c%t%z%t%Z; sleep 2 ; date +%c%t%z%t%Z

20210326 23:59:55

Fri Mar 26 23:59:59 2021        +0200   EET

Sat Mar 27 01:00:01 2021        +0300   EEST

Best regards,

Evgheni Antropov Software R&D Engineer +373 22 404 665 www.addgrup.com