@JG in SB I am using two calendars on my iPhone the first is Outlook 365 which I use for work and was provided by my employer, the second is Google which is on my Google account and is for personal use (I rarely put items on the iCloudg calendar which came with the iPhone). I am on iOS 8.1.3. Google is the default calendar in my iPhone 6 Plus settings.
I did not, and do not now, encounter any problem with my Outlook 365 calendar.
I had encountered the GMT issue with events created on my Google calendar reagrdless of the event being created on the iPhone or desktop. First time I created an event after the iOS 8.2 Beta claim of fixing the issue was today, and the problem had disappeared for me.
I think that it is unfair towards Apple to claim that it is not their doing. I don't know if it is or not but it is coincidental with the release of iOS 8.2 Beta. As you pointed out yesterday the release notes say that the issue was fixed.
Claiming that Apple did not do it implies that the fix must be on the client side, namely individual iPhones and iPads. But it is quite possible that the issue was buried on some servers and that it indeed was fixed by Apple. Assume for a moment that the client devices, iPhonea, iPads and iPods communicate with an Apple server which then in turn communicates with the Exchange or Google server and that the code on these server was changed by Apple. There is no evidence that Google did anything, nor is there evidence that Apple did or did not do anything to fix the issue. I doubt we will ever know but we do not know enough to reach a conclusion that it was Google who fixed the issue and that Apple has done nothing. I think they should be given the benefit of doubt.