Команда cal
Calendar for the month and the year.
cal [month] [year]
| month | Specifies the month for you want the calendar to be displayed. Must be the numeric representation of the month. For example: January is 1 and December is 12. |
| year | Specifies the year that you want to be displayed. |
cal - Would give you the calendar for this month.
cal 12 2000 - Would give you the calendar for December of 2000.