I use this for notes, and generally everything written; mainly for reference when looking back on old information. Today, whether I say Wednesday the 9th, or 2023-08-09, it's fairly inconsequential, but in 2-3 years if I have to reference a note, email or something else where I said today's date, I won't have to compare the date of the note to the calendar for that time period to see which 9th was on a Wednesday.

Everything you do now becomes history, so adapting to this format makes it easier when today becomes your history.