Okay, I decided to test your very interesting theory with the latest issue. I skipped the political scene article but I'm sure it's good, because it's by Ariel Levy. I did notice, however, that it began "Eight days before Christmas..." Bingo! Ditto with the next article, "Out the Window", bu Donald Hall, which began "Today it is January..." I skipped it but will probably go back to it if I have timje. I was most intrigued by the 4th article, "Slow and Steady" by William Finnegan. The photo is wonderful...two guys staring at the camera from a grassy perch. Only one of the giuys is a plowshare tortoise!! It begins, "One smuggler wore a trilby, which with a black band..." and then it goes on to describe two other smugglers. So, it breaks the rule by leading with character development.
Then comes a fiction piece, "Labyrinth" by Roberto Bolano. From what I can tell by a quick scan, it is all character development and little else! Written in the present tense and translated from Spanish, the storyt appears to take place sometime in the 1980s or 1990s. Obviously, if you want your article to be up front in the New Yorker, begin with a calender reference by all means!!