Dates are usually returned via OLE as a Variant data type.

You most likely need to do something like:

use Win32::OLE::Variant;

my $ole_date = $item->{ReceivedTime};
print $ole_date->Date('dd/MM/yyyy'), ' ',
    $ole_date->Time('HH:mm:ss'), "\n";
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Untested, but lifted from a piece of code which uses the SourceSafe OLE interface, so should work!