This hack will add a button to the edit post page, and when clicked will set the new issue_date and issue_time of the post to the current date and time.

On line 225 in _item.form.php you should see this:

$Form->date( 'item_issue_date', $edited_Item->get('issue_date'), T_('Issue date') );
		$Form->time( 'item_issue_time', $edited_Item->get('issue_date'), '' );[/php]

Change that to [php]		$Form->date( 'item_issue_date', $edited_Item->get('issue_date'), T_('Issue date') );
		$Form->time( 'item_issue_time', $edited_Item->get('issue_date'), '' )
		?>
<script language="javascript">
function SetPostDateAsNow() {
	//Source: http://wsabstract.com/script/cut165.shtml
	var mydate=new Date();
	var year=mydate.getYear();
	if (year < 1000)
	year+=1900;
	var day=mydate.getDay();
	var month=mydate.getMonth()+1;
	if (month<10)
	month="0"+month;
	var daym=mydate.getDate();
	if (daym<10)
	daym="0"+daym;
	
	document.getElementById('item_issue_date').value = year+"-"+month+"-"+daym;
	var hours = mydate.getHours();
	var minutes = mydate.getMinutes();
	var seconds = mydate.getSeconds();
	if (seconds<10)
		seconds="0"+seconds;
	document.getElementById('item_issue_time').value = hours+":"+minutes+":"+seconds;
}
</script>
&nbsp;&nbsp;<input type="button" value="Now" class="ActionButton" onclick="SetPostDateAsNow()" title="You can thank balupton for this one." />
<?php