Hello. I am using some dates I read in excel in R. I know the excel origin
is supposed to be 1900-1-1. But when I used as.Date with origin=1900-1-1 the
dates that R reported me where two days ahead than the ones I read from
Excel. I noticed that when I did in R the following:

> as.Date("2011-3-4")-as.Date("1900-1-1")
Time difference of 40604 days

but if I do the same operation in Excel the answer is 40605. Does anybody
know what can be going on?

Thank you
Felipe Parra

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