A one line a day journal would be a great thing to start on January 1st as a New Year's resolution, but if you go the DIY route you can start your journal whenever you want. I started mine on July 1, 2011.
I LOVE my line a day journal, and while your idea is nice, it kind of takes away the whole point. The best part about keeping a one line a day journal is being able to look back and see what you were doing on this day in past years. I am currently on year 3 and every night I am excited to crawl into bed, open it up, write a short entry and then see what exactly I did last year and 2 years ago. It is so fun!
It’s an entirely personal thing, to own and keep a diary or journal, and so it’s important that we love our diaries and their style reflects us and our style. There are so many different styles of diary and journal on shelves today, from year planners to one line per day journals. And although they are competing against smartphone apps and digital diaries, we believe that there is nothing as personal and charming as a private handwritten journal.