I copied your code into TEST.PRG and ran it as is. My result was 56.5467%. However, when I modified the code to like this, TTOC(dt.datetime,1) = TTOC(crmaxdt.datetime,1), I got 100%.

Upon further examination of my VFP settings, I found that I had the "Use System Settings" check box checked in my Tools:Options:Regional setttings. Unchecking this box and switching the Date Format between Short and American produced different results. American produced the 100%.

I have enough info here to continue. Thank you very much for your help. Also, Erik Moore responded with key info as well.

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>Sure. The erroneous results I was getting was that the number of records found was wrong, so I simply did a check on the reccount.

** TestLoop.prg
>LOCAL lnCnt, lnLoop
>EndFunc

>
>>Could you attached your code? Maybe I am doing something different.
>>
>>>>Looping thru the original code 5000 times produced the "correct" answer only 19% of the time. We modified the code with your "TTOC" suggestion, and looped thru another 5000 times; the "correct" answer was produced 55%, NOT 100%, of the time. Better, but nothing I want to rely on.
>>>>

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>>>
>>>Hmm. I just did the same test 10 times with 15000 iterations and it worked 100%