So, that's 1/13 = 8% longer than the same quarter last year, when they earned $75.9bn.
By my calculation, that makes this quarters target $82bn - and that's assuming the extra days were "typical" ones, whereas:
So, given the highest prediction is $80bn, the real headline should be "Apple expected to announce fall in profits".
Of course, those days were "stolen" from another quarter, but if you count it over the year then you'll pull in the inevitable lull in sales due to people waiting for the new iPhone and MBP...
Well, the MacBook isn't their biggest source of profits - and this is the quarter where their biggest competitor in the phone market, Samsung, suffered an epic fail. Then, the MacBook strategy was 'make people wait 18 months for a new model then, when they're desperate to upgrade (considering that switching to Windows/Linux isn't an impulse decision), jack up the prices'...
So they really ought to have done well last quarter.
It's true that the longer quarter makes for a bit of a distorted comparison. But there are factors that cut the other way as well. And the extra week (as compared to last year's first quarter) comes mostly after Christmas - it's 2 days in September and the last 5 days of December.
This year, an extra week of the new iPhone sales came in the 4th quarter rather than the 1st quarter. Last year almost all (i.e. all but 2 days) of the new iPhone sales came in the compared (i.e. the 1st) quarter. This year the iPhone 7 launch and thus some of that sales bump was pulled forward. Also, last year's revenue was helped by a 3.3 million unit iPhone channel build. Apple had expected the iPhone 6s not to do as well as the iPhone 6, but they underestimated how much less well it would do and in effect overbuilt the iPhone 6s and, by the end of the quarter, oversupplied it (at least as compared to previous 1st quarters).
Also, last year's 1st quarter benefited from accounting for a half billion dollar judgment against Samsung which this year's 1st quarter will not benefit from. There's also likely to be a negative YoY currency effect for this past quarter. How large will it be? I don't know, but maybe $1 billion. Apple estimated in October that it would be $650 million, but they obviously couldn't know what currencies would do over the rest of the quarter.