It'd probably be best not to use it to date a letter to a government department, or your Last Will and Testament; and neither is it terribly helpful when arranging a Zoom call; but, gosh, it does sum up the way a lot of us feel at the moment.
Blursday...a day when you're not sure what day it is.
As a matter of public information, today is a Sunday. But I only know because I'm writing a Sunday Rest for The Word Den.
Sunday Rest: Blursday. The word blur might be a variant of the word blear. In the 1200s blere meant to make dim.