subset dataset based on date comparison R

Question

I have a dataset as shown below

    Col1      Col2       Col3        CutoffDate
    12001     Yes        2008-08-15  2008-08-10
    12001     Yes        2008-08-         


        

Answer 1

You can just use regular comparison

dat[dat$Col3 <= dat$CutoffDate, ]
#    Col1 Col2       Col3 CutoffDate
# 3 12001  Yes 2008-08-10 2008-08-10
# 4 12001  Yes 2008-08-04 2008-08-10

Assuming Col3 and CuttoffDate are class "Date"

or maybe preferably,

with(dat, dat[Col3 <= CutoffDate, ])