DD/MM/YYYY or YYYY-MM-DD are formatting conventions for expressing dates. The date itself is probably converted from some date object anyway, like the Unix Epoch, and can be expressed in any variety of formats.
Wednesday, June 11, 2025 is a date. dddd, mmm dd, yyyy
or %A, %B %d, %Y
is a format.
Edit: I’m pretty sure I misread the comment above.
What do trees have to do with computers?