The IETF has been discouraging symbolic timezone names for many years.
I would say ditch them. For those who want a symbolic timezone (usually
recipients) it's so they can easily mentally convert to their local
time. Those folks are better served by a +nnnn offset that their local
MUA can unambiguously convert to local time for display. And for those
of us who do care about the senders local time, the +nnnn format makes
it a lot easier for me to do the mental conversion vs. deciphering some
unknown-to-me local-to-them timezone abbreviation.
Note that I was only suggesting that the timezone be displayed at the
local side, and although I didn't mention it I was only going to suggest
it support IETF-sanctioned timezones. But it seems like there's little
political will for that. That makes %(tws) and %(pretty) equivalent,
FWIW.
--Ken
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