If seeking a Photoshop template, check the Photoshop forum. However, Photoshop is not the ideal tool to create calendars. Calendars are typically created in page layout programs where you have control for tables, character styles, and paragraph styles.
I agree, Photoshop is not the best tool for creating calendar although you can use it for creating the design, not the template itself. You may want to search for other design programs that are specifically made for calendar creation.