cal

Prints calendar information. More information: https://ss64.com/osx/cal.html.

• Display a calendar for the current month:
  cal
• Display previous, current and next month:
  cal -3
• Display a calendar for a specific month (1-12 or name):
  cal -m {{month}}
• Display a calendar for the current year:
  cal -y
• Display a calendar for a specific year (4 digits):
  cal {{year}}
• Display a calendar for a specific month and year:
  cal {{month}} {{year}}
• Display date of Easter (Western Christian churches) in a given year:
  ncal -e {{year}}