use DateTime;

%OurLogs = get_the_time_from_the_log_file_as_a_hash();

$here = DateTime->new( time_zone => 'America/Indiana',
                           map { $_ => $OurLogs{$_} }
                           qw( year month day hour minute second ) );

$there = DateTime->new( time_zone => 'America/Los_Angeles',
                           map { $_ => $here->$_() }
                           qw( year month day hour minute second ) );