I'll have to look it up, I'll get back to you. It was during promotion for TIH and IM1 mostly from what I remember.
Last I heard all these films take place in the year they are released with the exception of Captain America and the after credits scenes. Why? Because it's easier to say that and move on. Nobody harps on the exact dates because they aren't important to the story. So if you follow that train of thought, none of them will match up precisely. I don't think the filmmakers put that much effort into a completely linear story.
Why did they use a 2010 newspaper in Iron Man 2? Because it was readily available in 2010. Why did they use a 2008 newspaper in The Incredible Hulk? Because it was readily available. I'm pretty sure 99% of people who watch these movies aren't trying to match things up by day and date, because there are too many discrepancies.
All that matters is the basic "before, after, during" events, not actual dates. So utilizing the comic book tie-ins, random props and comparisons to real world events are unnecessary effort because they won't match up.
Even in Captain America they say we fought for a few years. Some people involved with production gave precise dates and some didn't, but it doesn't affect the story whatsoever because we aren't seeing real world events as a comparison.
I have to say that I am pretty much in agreement - to a point. But since the pre-production of IM2 I think some very structured planning has taken place - including allocating years to dates. Simply because there are enough references to passages of time.
We know that IM2 takes place about 6 months after IM because it says tells us at the beginning after the credit sequence.
Also, interestingly enough, there has been references that suggest The Avengers takes place some two years after the previous films. If this is true it would kind of support both are arguments. Yours, because that would make the film set in 2012 (the films release year) and mine, because that would make the previous films taking place in 2010.