Was thinking about this a bit, and it seems based on the data we have been given by EBK, that the timestamps really don't matter at all. Perhaps if we could see the entirety of File B, this would be cleared up.

That being said, here is a more simple (or perhaps more cryptic) solution which doesn't rely on storing all of File B in memory:

#!/usr/bin/perl -wlaF,

BEGIN { open FH, '<', 'FileB' }

print "Loop tot-> $F[4]";

for ( 1 .. $F[4] ) {
    @G = split ',', <FH>;
    print join ',', $F[0], $G[0], $F[2];
}
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If you save this script as 'run.pl', you can call it like so:

chmod 740 run.pl
./run.pl <FileA
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The -a option turns on autosplit mode and the -F, option sets the field delimiter to a comma.

EBK, I'm curious to know whether this will work for you. Please let me know!

Best,

Jim