Forum:Release date of early DWM issues

So I notice that now that people's attnetion has been turned to the DWM pages by the Game of Rassilon, we're starting to get some actual leads to these articles. And the general skeletal lead goes something like:
 * was the issue of  released in

See, for instance, DWM 88 for an example of the form on a live page. But is this language accurate?

Just because DWM 88 has a cover month of May, was it actually released in May? If so, I'd find that a little extraordinary of something released by Marvel Comics. Comic books aren't like that, even to this day. Usually the cover date is a month or three of the actual release date.

And modern DWM gets around this with an entirely different language on the cover, which gives a four week range in which the publication is "current".

Does anyone know for sure when early DWM issues were released relative to the date on the cover? As an American, I have no idea, because back when I was getting these early issues, they were only available months and months after they hit British shelves. 19:06: Sat 08 Oct 2011