Steven Sanderson checks the week:
When working with dates in R, you may need to extract the week number for any given date. This can be useful for doing time series analysis or visualizations by week.
In this post, I’ll demonstrate how to get the week number from dates in R using both base R and the lubridate package. I’ll provide simple examples so you can try it yourself.
Steven also makes a good point about ISO weeks (which are common in Europe) versus calendar weeks.