Others point out missing tz.
It's also not that "user friendly": depending on their locale, users will usually expect for instance DD/MM/YYYY. Sorting by YYYY-MM-DD won't feel natural to them.
It's also not that "user friendly": depending on their locale, users will usually expect for instance DD/MM/YYYY. Sorting by YYYY-MM-DD won't feel natural to them.
It's dictionary sorting.