DateTime::Format::Epoch::DotNet is a Perl module that can convert DateTimes to/from .NET epoch seconds.

SYNOPSIS

use DateTime::Format::Epoch::DotNet;

my $dt = DateTime::Format::Epoch::DotNet->parse_datetime( 1051488000 );

DateTime::Format::Epoch::DotNet->format_datetime($dt);
# 1051488000

my $formatter = DateTime::Format::Epoch::DotNet->new();
my $dt2 = $formatter->parse_datetime( 1051488000 );
$formatter->format_datetime($dt2);

This module can convert a DateTime object (or any object that can be converted to a DateTime object) to the number of seconds since the epoch defined in the .NET Framework SDK.
Note that this epoch is defined in the local time zone. This means that these two pieces of code will print the same number of seconds, even though they represent two datetimes 6 hours apart:

$dt = DateTime->new( year => 2003, month => 5, day => 2,
time_zone => Europe/Amsterdam );
print $formatter->format_datetime($dt);

$dt = DateTime->new( year => 2003, month => 5, day => 2,
time_zone => America/Chicago );
print $formatter->format_datetime($dt);