TYB!
And just in case: last was 12494 making this one 12495.
>Anons know?
Judging by the banner link:
https://pbs.twimg.com/profile_banners/240454812/1593219557/1500x500
it was uploaded 1593219557 secs after 1970-01-01.
That's likely UTC, so it was changed a bit more than an hour ago on 2020-06-26 20:59:17 (ET).