I must be an exception. Throughout my career I used monthly calendars to schedule my work activity. For some unknown reason I kept them in a folder at my desk. Many times I had to dig into them to get a date or other info of something that occurred in the past.

To make a long story short, when I retired I had a folder of calendars with 40+ years of my work history. I still have it. Might use it to write a book someday.