| Ops.Date {base} | R Documentation | 
Operators for the "Date" class.
There is an Ops method and specific
methods for + and - for the Date class.
date + x date - x date1 lop date2
date | 
date objects | 
date1, date2 | 
date objects or character vectors.  (Character
vectors are converted by as.Date. | 
x | 
a numeric vector (in days) or an object of class
"difftime". | 
lop | 
One of ==, !=, <, <=, >
or >=. | 
(z <- Sys.Date())
z + 10
z < c("2006-06-01", "2007-01-01", "2010-01-01")