This is a problem on the C level, I believe. The localtime(3) call does not always check the current value of the TZ environment variable. To force it to do so, POSIX-compliant systems should use the tzset(3) call.
You can imitate this in perl via:
use POSIX; $\ = "\n";
$ENV{TZ} = "EST";
POSIX::tzset();
print scalar localtime();
$ENV{TZ} = "DST";
POSIX::tzset();
print scalar localtime();
perl -pe '"I lo*`+$^X$\"$]!$/"=~m%(.*)%s;$_=$1;y^`+*^e v^#$&V"+@( NO CARRIER'
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