It's important to have a clear sense of the passage of time in your book, but that can be difficult to do from notes. I find it easier to have a visual cue, so I use Excel to create a calendar with squares large enough to jot down major plot points in. There are calendar-generating programs available as well.
You can also find calendars for past years online, which can be convenient if you're writing historical fiction. The website below allows you to create calendars for different years in various countries which include holidays and phases of the moon.
Love this idea, Lisa! Especially for projects where the time line really matters. Thank you again for another great tip. I truly appreciate them.