Call me a heretic  

Hmm.
Others might complain that, in their religion, the week starts on Sunday. Many calendars reflect this preference, too . . .
Would you be happier if those 1s were aligned so that the serif overhung the margin ?
I recall working exclusively with Helvetica Medium Letraset, in the early '70s. For a while, the office I worked for played with very tight-set kerning. This is at least tolerable with Helvetica, but still reflects only one of several differing philosophies. I prefer a more nuanced kerning, myself. What about you ?
Or are you (and Heath ?) on a bender, out there in Web-land ? I'm more than a little plastered myself, at the moment . . .

.
I have had 3 sips of wine while decanting all my food into old coffee jars, so there. Lets see what happens later.
Terrible design, what about circling dates or writing little notes? Not easy on the eye at all.

No, not on a bender.
I'm a sleepy, agreeable drunk-- I only attack hallowed calendar designs when perfectly sober.
Seems to me that a calendar should be a nice tight grid. I guess I'd prefer this design if it tried to be more Swiss, less Italian. I'd like to see the numbers centered, I think.

I've been
reading mystery novels of various kinds and vintages for some years now. I note that each and every one (save some that occur as series by the same publisher) employs a unique style of chapter heading, with its own numeral face, chosen by some book designer (lots of women in this field, apparently). Some of the combinations are really nice to look at, while others are misconceived. The variety of numerals are endless, it seems -- and the placement and relative point size (with the word "chapter" often included) create a never-to-be-repeated composition. Helvetica is the last thing one expects to see, for some reason, in this context. I've seen pages that I wanted to photocopy, and now I wish that I had . . .

All dates lower right hand co...
All dates lower right hand corner and 1/4 the size, year and month to the left with month first then year, perhaps even year could be done away with, only necessary on front cover?

I Googled
Swiss calendar design -- and got a series of soft-porn designs for both genders (?).
Ugh.
How about this:
http://swisslegacy.com/2010/08/18/calvetica-the-fastest-calendar-app-on-...

Funny, I just googled "Swiss Calendar" (prompted by your tantalizing results)
... and all I got was calendars & watches. I wuz robbed!

That Calvetica calendar app is much more pleasing than Vignelli's.
THAT'S the way a calendar should look, hmph!

you're a heretic
well...you asked

Damn that Massimo Vignelli!
I guess I still blame him & his damn map for my inability to learn the NY subway system, while my mind was still young, agile, and capable of learning new tricks!
"On purpose we rejected any visual reference to nature or landmarks," Vigenlli told Men's Vogue in 2008. "People expected a map instead of a diagram. But diagrammatic representation is common practice around the world since the London Underground map of the thirties."
F-you, Vignelli! "I-a do-a this on-a purpose... is-a common-a practice around-a the rest of-a the world...". Yeah? Well also common around the rest of the world is government censorship and men in Speedos, you Mr. fancy-pants, Di Frutta wannabe.
http://idsgn.org/posts/designing-a-better-subway-map/

You must have the filter set...
You must have the filter set to moderate or something,.
C'mon WHC you sound a bit boorish, the London Underground map is really good, the rest of the world has taken up so many North American ideas...is taking even a little thing like a different idea for a map too much to take?

Perhaps the London Underground is a better train system.
The New York subway is a tangled mess, we need a similarly messy map to navigate said mess.
And, better men than YOU have called me "boorish". 🙂

[edit]
The link beneath the NYC map above goes way further than anything I could say on the subject . . . ! Nice page.
http://tinyurl.com/3qll78k

You are a heretic
william-holden-caulfield,
I do not have a problem with the Vignelli calendars but I prefer the Pirelli limited edition calenders better should I desire paper products. The Audemars Piguet 2100 desk calendar is as good as it gets.