When a file is copied on NTFS the Modified Date is also copied?

Solution 1:

No, you cannot trust any of the date/time stamps on a file. It is relatively straightforward to change the timestamps

Solution 2:

You can't trust it - there are tools (such as 'touch') which allow you to set such file metadata.

http://www.mkssoftware.com/docs/man1/touch.1.asp