Re^2: matching datetimestamps and concatenating data where timestamps match from multiple large datafiles

[CountZero]

Did you try your code?

One cannot use next or last inside a do { ... } block. As the docs say : "contrary to popular belief do{} blocks, which do NOT count as loops".

It is not a loop, so you cannot use loop-control commands. You can double the curly braces and put a bare block inside the do { ... } block. Bare blocks are loops that execute once. The loop-control commands will work ... somewhat, but last will not do as you might expect: it will exit the inner (bare) block, only to fall into the outer (do) block and hence has the same effect as next.

[hdb]

I did not try my code as it is only a sketch of how to start.

Thanks for pointing out this flaw, I was not aware of it. I did put the while at end to avoid the duplicate checking of the times. You have solved this directly in your code by adding another check.

[CountZero]

Yes, the duplicate checks do not make me very happy, but I cannot see another easy way out.