Use the Calendar

With the following commands you can have different views and displays of the Calendar in the different versions of Linux.

cal -3 = "Simply display the calendar"

cal 1 2008 = "This command display a calendar of a particular month of the year"

date -d fri = "Display the date of the next on the current or next week"

date --date='25 Dec' +%A = "Tell you which day will be Christmas this year"