How To Use Weekdays Function In R

R Programming

I always find the weekdays function in R to be extremely useful, especially when working with date and time data. The weekdays function allows you to extract the day of the week from a date object, which can be quite handy in various data analysis and visualization tasks. Let’s dive deep into how we can use the weekdays function effectively in R.

Understanding the weekdays Function

The weekdays function is part of the base R package and is used to obtain the days of the week from a given Date, POSIXt, chron, yearmon, yearqtr, zooreg, timeDate, xts, its, ti or jul classes. This function returns the names of the days of the week corresponding to the dates provided.

Basic Syntax

The basic syntax of the weekdays function is as follows:

weekdays(x, abbreviate = FALSE)

Where x is the date object for which you want to determine the day of the week, and abbreviate is a logical value indicating whether the returned day names should be abbreviated or not.


Let’s say I have a date object, my_date, and I want to find out the day of the week for that date. I can use the following code:

my_date <- as.Date("2023-07-15") weekdays(my_date)

This would return "Saturday" as "2023-07-15" falls on a Saturday.

Personal Touch

One of my favorite uses of the weekdays function is in analyzing trends or patterns in time series data. By extracting the day of the week from a date column in a dataset, I can easily group and visualize trends based on weekdays. For example, I once used this function to analyze customer purchase patterns across different days of the week and it provided valuable insights for marketing strategies.


The weekdays function in R is a powerful tool for working with date and time data. Whether it's for simple tasks like identifying the day of the week for a specific date, or more complex analysis involving time series data, this function has proven to be indispensable in my data analysis projects. I highly recommend experimenting with it to unlock its full potential in your own work.