How do I preserve date/time when converting to DNG?

When I convert a file to DNG format in Lightroom, it changes the capture time in the metadata to the current date and time, rather than copying the source data.  Is there a way in which I can tell it to leave my dates alone?

You wrote: “I noticed my mistake. It seems that what the conversion process was changing was the ‘Metadata Date’ and ‘Date Time’ fields, but ‘Date Time ‘" and ‘Date Time Digitized’ were remaining the proper, original date. The cause of my confusion was that my Metadata panel view was hiding all but the ‘Date Time’ field, so it appeared as though it had overwritten my prior date information.”
Date/times in photo metadata can be very confusing.  There are all these fields with confusing names imposed by legacy industry standards -- I challenge anyone except a metadata nerd like me to remember the meanings and differences of Date/Time, Date/Time Original, Date/Time Digitized, Capture Time, Metadata Date, Modify Date, ....  The worst are the two XMP fields Date Created and Create Date, which have two very different meanings!  And every app and operating system makes a half-hearted attempt to "simplify" it for the user by choosing different names.   
LR makes no serious attempt to make this easy for the user, and over the first several versions, it's handling of date/times was pretty sloppy. (It still has outstanding bugs that don't crop up that often in practice.)  You would think that at least LR would provide roll-over tool tips on the field names in the Metadata panel explaining each field.

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