Find Date After a Number of Days in R

In our daily life, often we want to know what will be date after some number of days. This is also required in professional life, especially in those professions where we work on projects and have tight deadlines. To find the date after a number a certain number of days we can just use plus sign after reading the date with as.Date.

Example

> as.Date("2001-01-01")+30
[1] "2001-01-31"
> as.Date("2020-06-30")+30
[1] "2020-07-30"
> as.Date("2020-06-30")+50
[1] "2020-08-19"
> as.Date("2020-06-30")+100
[1] "2020-10-08"
> as.Date("2020-06-30")+120
[1] "2020-10-28"
> as.Date("2020-06-30")+15
[1] "2020-07-15"
> as.Date("2020-06-30")+45
[1] "2020-08-14"
> as.Date("2020-06-30")+40
[1] "2020-08-09"
> as.Date("2020-12-25")+20
[1] "2021-01-14"
> as.Date("2020-12-25")+300
[1] "2021-10-21"
> as.Date("2020-12-25")+125
[1] "2021-04-29"
> as.Date("2020-12-25")+80
[1] "2021-03-15"

We can also use / to read the dates as shown below −

> as.Date("2020/12/25")+25
[1] "2021-01-19"
> as.Date("2020/12/25")+200
[1] "2021-07-13"
> as.Date("2020/12/25")+52
[1] "2021-02-15"
> as.Date("2020/12/25")+90
[1] "2021-03-25"
> as.Date("2020/12/25")+500
[1] "2022-05-09"
> as.Date("2020/12/25")+1000
[1] "2023-09-21"