:/usr/share/zoneinfo$ re.pl
$ use DateTime::TimeZone;

$ DateTime::TimeZone->new(name => "EST5EDT");
$DateTime_TimeZone_EST5EDT1 = DateTime::TimeZone::EST5EDT=HASH(0x8ffd9e0);
# this works

$ DateTime::TimeZone->new(name => "MET");
Runtime error: Invalid offset: MET
# this does not