Re: matching datetimestamps and concatenating data where timestamps match from multiple large datafiles

[RichardK]

I assume that your files must be already sorted as they're log files, then what you are trying to do is a type of Merge Sort

You can then process you files one line at a time. Read the current line for fileA and decide if you want to write the current lines for fileB and fileC, and when you write a line from a file get the next one. Keep going until you run out of lines.