Managed to fix this for NWiki for Moodle 1.6 by the following changes in mod/wiki/locallib.php (backported from NWiki for Moodle 1.7/1.8/1.9)
around line 1470
replace
$data->created = $WS->dfform['created'];
with
$data->created = optional_param('dfformcreated',NULL,PARAM_INT);;
Not a huge issue, but may help others working with NWiki and Moodle 1.6 before the big upgrade to 1.9
Wiki
NWiki for Moodle 1.6 - created date issue
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