create log files

is it possible to add logfiles i have old data that is writen down (going back a couple of years) which i wish to at to wd.if so could you explain how it is done

there are a number of threads explaining how to do this
you will need to add data to a needed logfile, in the correct format (e.g for units, data position and amoun and time and date format) (compared to a normal logfile)
and add at leat the last 10 minutes before midnight of each day and include the midnight change over time period
and then add the max/min values for that day
and repeat for each day
then convert that logfile to data file