Extract month and year from a zoo::yearmon object

Question

I have a yearmon object:

require(zoo)

date1 <- as.yearmon("Mar 2012", "%b %Y")

class(date1)

# [1] "yearmon"

How can I extract the month and year from this?

month1 <- fn(date1)

year1 <- fn(date1)

What function should I use in place of fn()

Answer 1

To extract month and year from a yearmon object, you can use the format function from the base package as follows:

library("zoo")

myDate <- as.yearmon("Apr 2005", "%b %Y")

> format(myDate, "%b")

[1] "Apr" #Month as character

> format(myDate, "%Y")

[1] "2005" #Year as character

> format(myDate, "%m")

[1] "04" #numeric month as character

> format(myDate, "%B")

[1] "April" #Full month name as character

To convert the output to a numeric type:

>as.numeric(format(myDate, "%m"))

[1] 4

> as.numeric(format(myDate, "%Y"))

[1] 2005

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