在R中按日期抑制年份

Question

I am trying to create a date class without the year in R using a date and month. For example:

frame <- paste(c("March", "December", "January"), c(9,16,27))
as.Date(frame, format = "%B %d")

This automatically outputs the current year:

[1] "2014-03-09" "2014-12-16" "2014-01-27"

Is there any way to create a date class and suppress the year? I would like to do this in order to look through a frame of dates from multiple years to create a 'quarter' indicator. Thanks.

Answer 1

the way you are currently using format is for input. For formatting the output, try:

frame <- paste(c("March", "December", "January"), c(9,16,27))
format(as.Date(frame, format = "%B %d"), '%B %d')

[1] "March 09"    "December 16" "January 27" 

which is exactly what you had wrapped in format