The thing is, the screenshot _has_ labeled days. The calendar helpfully labeled February 2 as a Thursday.
[1] https://blog.twitter.com/engineering/en_us/topics/infrastruc...
Keep in mind that I open all links in a new private windows except for few services for which I stay logged in.
On twitter, clicking sometime opens a new link, sometime shows the full version of an image. Trying to right clicking all the time doesn't work, because it doesn't do anything when it is a small image that needs to be disaplayed in its full version - because they change the click behaviour via javascript.
Pretty poor bug