Thanks.

Gabor Grothendieck wrote:
Assuming the first row is the comparison row convert
to Date class and calculate:

DF[] <- lapply(DF, as.Date, format = "%Y/%m/%d")
pmin(DF[[2]], DF[1, 2]) - pmax(DF[[1]], DF[1,1])

Please be explicit next time in formulating your queries
as requested in the last line of every message to r-help.

Gabor, I've able to be explicit only after reconsidering my original question and the structure of the data after reading your previous replies. Thanks for your time.

Best regards,

Ricardo

--
Ricardo Rodríguez
Your XEN ICT Team

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