cal

A Linux-style calendar utility for Mike Riley's Elf/OS.

If your Elf system includes an RTC, typing cal on the command line will show a calendar of the current month, with the current date highlighted. (The highlighting assumes a VT100/ANSI style terminal.)

   $ cal
   
    February               2021
    Sun Mon Tue Wed Thu Fri Sat
          1   2   3   4   5   6
      7   8   9  10  11  12  13
     14  15  16  17  18  19  20
     21  22  23  24  25  26  27
     28
   $

Even without an RTC, you can use cal to display a calendar of any month between the year 1766 and 2499 by typing commands such as:

   cal February 2021
   cal feb 2021
   cal 2 21

The month name can be abbreviated to any unique month name prefix. ja will get you January. f will retun February. ju won't work, but jun will return June and jul will return July.

Two digit year numbers between 01 and 99 are interpreted as 2001 to 2099.