I use kepware all the time the best thing to do is download V5.x this will run for 2 hours without a license, just re-start it after that time.
Download SQL Server express (2012 is the latest) in SQL Server create a blank database, then run kepware configure the tags you want to read (you can use the simulator built in to kep) then configure the datalog.
You can use excel to get at the data open up excel, start a new macro, run a database query when asked sort by datetime (limit this to a few lines) > This date < this date)then save the macro then go into vba & there you will see the macro, you can copy this into a sub to be called via a button & say calendar control on a form then modify the copied code from the macro to insert for example variables from the calendar control where the datetime stamps are (you need to know the sql format for this) an example is import data from 04/07/2013 00:00:00 to 04/07/2013 23:59:59 from mytable sort by datetime.
Unfortunately I'm just about to travel or I would send you a spreadsheet with the code for one of my queries & won't be back for another 3 weeks in the sun but if still interested send me a message & I will send it to you when I get back