[tz] Regarding changes of time format the Philippines

[Paul Eggert]

I am not observing either problem on Fedora 26, which currently uses 
tzdb 2017b and Perl 5.24.3. I ran the following shell commands. Please 
try them on your platform. If they work for you, can you give examples 
of similar shell commands that fail for you?

$ TZ=Asia/Manila date
Wed Nov  1 01:52:50 +08 2017
$ TZ=Asia/Manila perl -E'use DateTime; say 
DateTime->now(time_zone=>"local")->strftime("%Y-%m-%d %H:%M:%S %z (%Z)");'
2017-11-01 01:53:22 +0800 (+08)
$ perl -E'use DateTime; say DateTime->VERSION;'
1.43
$ perl -E'use DateTime; say DateTime::TimeZone->VERSION;'
2.13

If I change "local" to "floating", I get symptoms similar to what you 
report:

$ TZ=Asia/Manila perl -E'use DateTime; say 
DateTime->now(time_zone=>"floating")->strftime("%Y-%m-%d %H:%M:%S %z 
(%Z)");'
2017-10-31 17:57:03 +0000 (floating)

However, this is what "floating" is supposed to do, and it does the same 
thing if TZ="America/Los_Angeles".