Hi again
I found the 'bug' (?):

Time::Timezone accepts 'MEZ'
which is the German-version of middle european time or 'met' (try:)

   $mez = tz_offset('MEZ'); # correct
   $met = tz_offset('met'); # correct
[download]

while parsedate doesn't know 'MEZ' (or 'mez),
it gives back gmt when called with ZONE => 'MEZ':

   $gmt = parsedate( "$d $t", ZONE => 'MEZ'); #false
   $met = parsedate( "$d $t", ZONE => 'MET'); #correct
[download]

Carl