Brian P. Cleary 
Second, a Minute, a Week with Days in It [PDF ebook] 
A Book about Time

The zany CATegorical cats introduce the measurement of time, from seconds, minutes, and hours up to decades. Brian P. Cleary and Brian Gable bring their winning teamwork to this playful, fun look at learning about time.From the author and illustrator duo of the best-selling Words Are CATegorical(R) series, Math Is CATegorical(R) introduces basic math concepts for young readers and reveals that sometimes math is easier to show than explain! Pairing clever rhyming verse with comical cartoon cats, Brian P. Cleary and Brian Gable help children add up just how fun math can be!