Office calendar

My office calendar, courtesy of the Avondale firm of H.L. Yerkes & Sons Inc., Growers Supplies, has a page for each week. On the back of each page there's some statistical information, sometimes useful (recommended body weights, suggested baking temperatures) and others times not so much: the number of days between the same date of two months (excluding leap years). All I could think of was the poor intern who had to sit there in front of a calendar counting off the number of days between, say, Feb. 1 and Nov. 1. Welcome to the publishing world, kid!