Old SMS had some pretty crappy character limits so they went with the option that didn't is basically how I see it. Now, LINE is king. I've only used text with like two people ever in Japan.
Japan is YYYY-MM-DD, but when we talk about dates where a year is unneeded, we just cut it off which leaves it in the US standard format of MM-DD, much to the annoyance of non-US foreigners living here.
I thought the name sounded super familiar, but I had to look it up. My dad was into BBS and CompuServ in the '80s. He eventually got AOL, which is where I got started with NNTP. I really need to get his history on these things. I know that, when I was super young in the early '80s when they divorced, he was often spending a lot of time online. I'd really like to know more about that era as my memories are scattered and fractured.