Please see #6962.
AS::TWZ#strftime's behavior isn't equals to Time#strftime.
It seems %:z and %::z format are ignored.
Fix #6962. AS::TimeWithZone#strftime responds incorrectly to %:z and …
…%::z format strings.
@kennyj great. Could you add a CHANGELOG entry?
@kennyj thanks for the fix. i was planning to do something similar, but felt it was a little brittle wrt changes to the time format string in future versions of Ruby.
@rafaelfranca I'll submit PR to 3-2-stable soon, because this is bug, and I'm going to add a CHANGELOG entry to 3-2-stable.
Thus I want to be merged this PR as it is.