Or, the idea I like best:

* At the end of each day, write one or two sentences about the most interesting thing you did that day, or the most interesting thought you had, or the most interesting thing you heard or read.

For writers, this could become a great source of ideas as well, and it means you’ll write at least a line or two even on days that you don’t have time for a proper writing session.

I suggest you get a nice notebook or datebook or even a calendar to use.

 

I did this last year, and found it to be not just a great way of keeping a diary, but also a place to put ideas and quick notations on the day.  I found that a full page-a-day was too large, and instead got a weekly/monthly calendar, and that was perfect.

All it takes if a few seconds a day to sum up your day, or something that you saw, or the germ of a story idea, and write it down.  You can also put it in your smartphone’s calendar.