Centering, Personal Development
"The word 'planner'—as in an object used to facilitate planning— wasn’t introduced into the English language until the 1970s." 
In the 1770s, an aspiring publisher, Robert Aitken, developed what is generally recognized to be the first planner in America. Aitken’s “Register” displayed an entire week on a page. Image from The Accidental Diarist, A History of the Daily Planner in America, by Molly A. McCarthy

"The daily planner as we know it descends from the almanac—a yearly publication listing useful information such as weather forecasts, currency conversions, an interest rate schedule, and planting schedules. Next to the Bible, the almanac was the bestseller of early America. And the almanac was most valued for its calendar."

"...Today we tend to think of daily planners as records of what will happen. But most of its early users saw daily blank space in their notebooks as a way to record what had happened. It was a way to account for one’s time and how it was spent. 

"It’s not until the 20th century that we see pocket diaries regularly used for recording future events." - Jillian Hess

Article: A Short History of the Daily Planner