Calendars are broadly used in society to display temporal information and events. This paper describes a new calendar display for plotting data, that includes a layout algorithm with many options, and faceting functionality. The functions use modular arithmetic on the date variable to restructure the data into a calendar format. The user can apply the grammar of graphics to create plots inside each calendar cell, and thus the displays synchronize neatly with ggplot2 graphics.<img src=“http://feeds.feedburner.com/~r/ProfessorRobJHyndman/~4/BaHJd9BS8tA" height=“1” width=“1” …