Moving saved .eml files into Outlook

I have thousands of saved .eml files, to move into Outlook 2010. However - when I drag and drop them into the folders on Outlook 2010 - every file has the "date received" as today's date ( in past scenarios where I've done this - it automatically shows the original email date).

i.e. - every file moved today - shows October 9th, 2011 as the date received - even though the email may have been from August 2009 for example.

Any thoughts on how to move the eml files into  Outlook 2010 - with the original receive dates being displayed.

Thanks for your help.

TmaxPa