OK, so what I can gather is the following:
- The issue is not related to the iPhone 5 specifically as we have reports that this also happens on Samdung phones as well so this makes it a VZW issue, not an Apple issue necessarily, unless both Samdung and Apple are using the same LTE chipsets and making the same mistakes
- The two ways to fix it are, 1. Turning off LTE and, 2. Setting Date and Time to Manual
What I have noticed in my situation is that the Date/Time shift occurs when LTE is an inconsistent signal. I work an hour away from home. My home town (Roseville, CA) has very good LTE coverage and I have never seen the shift occur there.
My office is in Grass Valley, CA where coverage, in general, is not the best. There is LTE here but it's sporadic and the phone switches to 3G fairly consistently and even in many cases drops connection dependng on where I am in my office building. When I am in Grass Valley I lose correct Date and Time and I find out that it's gone when I recieve an iMessage/text. I've seen the Date and time go away, move to another part of my office building where I can get get good LTE (like next to a window or even outside) and the Date and Time come back and are correct.
My workaround is to turn off automatic time and just set the date and time on the phone manually. Then all my stuff works, calendars, alarms, texts, etc... with no issues.
A co-worker has the iPhone 5 on VZW as well and he lives here, he has a problem with correct Date and Time going away also and all the time. I told hime to set it to Manual and he's been happy.
The bigger issue is that my company is looking to switch from AT&T to VZW becasue VZW's coverage here is far superior. They refuse to switch until this issue is addressed satifictorily. This is easily 30-50 handsets, possibly more, and typically they buy iPhones.