How do i get the number of each month?

I have a data frame with a column of date objects. How can i get a new column with the number of a month?
example: January -> 1, february -> 2 …

I need a new column with the numbers of each day of the month, too.
example: 2022-01-01 -> 1 , 2022-01-02 – 2

>Solution :

You can use the following code:

df = data.frame(date = as.Date(c("2022-01-01", "2022-01-02")))
df[, "month"] <- format(df[,"date"], "%m")
df

Output:

        date month
1 2022-01-01    01
2 2022-01-02    01