We host our own site but I am just the front-end person maintaining the site
content. Earlier I spoke with our tech guy who maintains the back-end and who
installed the upgrade for my Mac, and he did not know why the times would be
different either.

He was busy with another problem so I cannot find out if the local time on the
server is true or not, but I'm guessing it is correct because DW is changing
all the files I upload to the time and day of the upload.

We had this problem before when I went from 8 to MX and I think it was a
setting problem but I can't find anything in preferences to fix it. Sure is
frustrating. I am 99% the only content manager but occasionally the tech guy
will change a file and the only way I can tell that is to check the remote info
but now it's different than my local file so I don't know which is right.
Ughhh!!!