LogScrobbler converts the time in the file to UTC so if you are in PDT LogScrobbler will convert the time to time +7 Hours, if your log does not contain timestamps use the using the zero timestamps button LogScrobbler will get the current time from your computer clock, total up the time from all of your tracks, subtract that from the current time,(and stamp each track with the proper time based on length) this will make it look like you just played all of the tracks in order up to the current second. then it will convert those to UTC, in my case being PDT it will add 7 hours to the tracks, when Last.fm gets them it will look like I just played them, and the last track will show up as "Just Played"
here is a link referring to PDT to UTC
http://www.timeanddate.com/library/a...es/na/pdt.html