I have numeric values equivalent to dates in R (dates imported from .csv file and modified to numeric using also as.Date(..., origin= "1899-12-30")) and for now I have numeric values of dates according to R standards (ex. numeric value '18365' means 2020/04/13).
I need to modify these values into numeric values equivalent to Excel numeric dates (ex. mentioned 2020/04/13 into 43934).
How can I do that?