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>John appears to be right, that it's VFP6's strict date handling. If you SET STRICTDATE TO 0 and then do the index it's OK. It's even OK to SET STRICTDATE and then use the file and set the tag, you don't get any errors. But you really should use the {^yyyy/mm/dd} format for date constants, as Garrett suggested.
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Glad to hear it's resolved....and, yes, get used to VFP6 date formatting or the STRICTDATE stuff will "gotcha" all the time.