Thanx a lot!
But I noticed one problem. When I convert times, those suggested modules convert the time to GMT time. So the hour changes (offset +1). I can compute the offset like:

use DateTime;
my $now = DateTime->now( time_zone => 'local' );
print $now->time_zone->offset_for_local_datetime( $now );
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but I assume there is a way to set the offset to zero ? For what I need to do, the input-time will always be GMT time, no matter what the localtime of the system is! An other thing I assume you always have todo is to

Luca