DST time changes applied to Arizona timezone

Hello,

I am located in Arizona where we do not participate in daylight savings time. Though I had Arizona selected as my timezone in the Office365 settings and local computer, all of my calendar events have moved back one hour. I did read about the DST update tool from Microsoft, but I am on a Mac. So I believe that is of no help.

1. Is there an easy way to correct this discrepancy and move all my events forward to the correct time?

2. If not, will changing the time zone in Office365 adjust the appointment times?

Thanks,

JNelson