Doesn’t matter how many times I go to the calendar, the dark underline (or overline) on the first day of the month always makes me think that it’s “today”.
We are accustomed to seeing a horizontal line as a selector; and while a hue can also mark a selector, the lighter alpha compared to the much darker line draws much more attention!
The current day is a light blue hue which can be difficult to see on some screens - especially since screen blue light filters have become commonplace. (Even available in Windows 10 and phones inbuilt)
I would recommend changing the horizontal line to a vertical line on the left side of the first day of the month, as when scanning left to right with one’s eyes, this will indicate a “break” in the context of week/month.
(due to limit of one image)
Current Asana calendar on the left, and my proposed changes on the right!