I would like to know how to add or substract a number to a date. Here is an example of a date I have to use :
"2000-01-01"
I would like to add 1 year to this date to get :
"2001-01-01"
I tried date + 1 but it doesn't work since it's 1 is an integer.
It is probably simple but I would like to know how to do it.
Also, is it possible to do it with the months and/or the days?
Thanks!
for such operations I usually like to use the lubridate package.
Here's how I would do it :
library("lubridate")
date <- as.Date("2000-01-01")
date %m+% years(1)
date %m+% months(1)
date %m+% days(1)
So in your case :
date %m+% years(1)
[1] "2001-01-01"
Edit : I suggest you use %m+% instead of a simple + since the former:
"add and substract months to a date without exceeding the last day of the new month."*
Note : you can also use %m-%.
