I have following date in string format and I need to convert it to milliseconds using a Perl script. I have tried to convert it using `DateTime::Format::Strptime` and it returns 0 after convert to millisecond.

Date String : 01-13-15:14.16

```
#!/usr/bin/perl
use DateTime::Format::Strptime;

my $strp = DateTime::Format::Strptime->new(
    pattern => '%m-%d-%y:%H.%M',
    on_error => 'croak',
);

my $dt = $strp->parse_datetime("01-13-15:14.16");

print $dt->millisecond."\n";

```

How can I convert datetime to milliseconds