I recently set up a lab to test the CE version and found that when I tried to change the time zone from America/Los Angeles to my time zone the wizard cancelled the installation and generated an error in the "/opt/zextras/libexec/zmsetup.pl" file.
The solution I found was:
vim /opt/zextras/libexec/zmsetup.pl
Search for line 2497 and replace the default time zone with my time zone like this:
....
detail("Local timezone detected as $tzname\n");
my $tzdata = Zimbra::Util::Timezone->parse;
my $tz = $tzdata->gettzbyname($tzname);
$config{zimbraPrefTimeZoneId} = $tz->tzid if (defined $tz);
$config{zimbraPrefTimeZoneId} = 'America/Bogota'
if ($config{zimbraPrefTimeZoneId} eq "");
detail("Default Olson timezone name $config{zimbraPrefTimeZoneId}\n");
....
Then run: /opt/zextras/libexec/zmsetup.pl to continue the installation.
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