I’ve been asked a couple times why the dates on my site are displayed the way they are. I use ISO 8601 for writing dates because it removes any ambiguity and eliminates confusion between the various common regional and international formats. YYYY-MM-DD is also logical for sorting and categorizing data using computers. I use a 24-hour time format, but tend to use my local time zone rather than UTC. The linked document above goes into detail about why ISO 8601 exists and why it’s a good idea to use it.