I am very skeptical of the claims on Dark Horse's site that all their Godzilla comics were published on the first day of a given month - that would run the gamut with regards to days of the week. Further investigation is needed, but from this Reddit thread it sounds like comic books have been published on specific days of the week since before Dark Horse's time. The first-of-the-month dates may instead be placeholders.
Topic on User talk:El spigre
oh dang, wasn't even aware of that, I was wondering why one issue came out June 1 and the next June 2. so what should we do, just leave it for now since its the only confirmed dates we have?
I'd prefer going back to just months and years until we can find more reliable sources. I found dates for the 1998 reprints on PREVIEWSworld, at least. I'm going to my comic shop tomorrow, so I can ask them how they'd figure out the rest.
got it, I'll just change the dates to the month then
Update: The employee I spoke to wasn't sure if exact dates could be found for comics that old, but said he'd investigate further.
Sick, hopefully an answer comes forward so we can properly verify dates