[R] Convert number to Date

[anna]

Hello, I have a date value in excel: 1/4/2010 which in number format gives me
40182. When I read this with read.xls from R I get same 40182 so what I do
is that I use the as.Date() function but here is what the as.Date() function
returns me:
> as.Date(40182)
[1] "2080-01-06"
Why don't I get the same thing as in excel?
Thanks!

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Anna Lippel
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