How to keep Date created and Date modified when converting nef to dng

Hi
I noticed that when we convert NEF files to DNG in it properties the Date Created and Date Modifed are changed to the present date and not the original dates of the files in question. Is there any way to make such a conversion without changing these proeprties? Yes, I know 'Date taken' does not change--but this info does not show up when you hover a file only the info in its properties does hence me asking the question.
Also am I correct in assuming that this conversion is 100% lossless, nothing but nothing is lost in the qualtiy and info of the file (besides the file size)? Thank you
OS: Windows 7 (64)

A DNG from an NEF is a new file so it’s Windows dates are as of its creation on Windows.  The date modified would further change if you updated the DNG with a new preview and/or embedded metadata into it. 
If you need the files to have the camera’s creation date, then use Windows Explorer to copy them, don’t convert to DNG, and just Add them to your LR catalog, and tell LR not to add a timezone or otherwise adjust the timestamps which might also update the file modification time.

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