It’s not simple, though. Simple would be something like an object wrapping YYYY-MM-DD, like a COBOL programmer in the 1950s would’ve used. Instead, people have made thousands of variations of bugs around the complexity even basic usage forces you to internalize like the month number being zero-based while the year is 1900-based but the day of the month is 1-based following standard usage.

It's not simple, it has hidden pitfalls and footguns. Using it is the fastest way to blood on the floor (to quote a senior developer I worked with).