Each month of the year has a photo of Panzer doing one of his favorite cat activities. All the details are available at the Calendar Store.
For those who want to know the U.S. holidays each month there is the Panzer the Cat 2018 Calendar with U.S. Holidays
For those who don't want/need to know the U.S. holidays each month there is the Panzer the Cat 2018 Calendar without U.S. Holidays
If you're interested in other cat calendars, scroll down the page for three other calendars, including kittens, baby kittens, and black cats.