Here is a Perl script I made to generate a batch file to execute the pdm_ldap_import with the appropriate parameters:
#!/usr/local/bin/perl
# -----
# This script creates a batch file to be run at least 24 hours from now
# to import/synchronize any contacts that have been created or updated since the last time the import was run.
# This should be run after midnight local time.
# To execute, use command pdm_perl buildImport.pl
# -----
# incorporate functions
use strict;
use warnings;
use POSIX;
use Time::Local;
# get the constituent components of the local date/time
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime();
# calculate the offset in hours between local time and GMT
my $epocL = timelocal($sec, $min, $hour, $mday, $mon, $year);
my $epocZ = timegm($sec, $min, $hour, $mday, $mon, $year);
my $offset = ($epocL - $epocZ) / 3600;
#if the offset is a negative number (timezones east of GMT) just use GMT
if ($offset < 0) {$offset = 0}
open(BATCH, ">ADimport.bat");
# output first part of import command
print BATCH "pdm_ldap_import -l \"(&(sAMAccountType=805306368)(whenChanged>=";
# output variable part of commnd
printf BATCH "%04d%02d%02d%02d", $year + 1900, $mon + 1, $mday, $offset;
# complete the command
print BATCH "0000.0Z))\"\n";
close(BATCH);