Why do some calendar events shift in time when daylight saving time goes into effect?
You may be able to fix it by doing the following:


Open the Settings on your iPhone
Select "Mail, Contacts, Calendars"
Scroll down to the Calendars section
Select "Time Zone Support"
Turn on Time Zone support


Or maybe you want to turn time zone support off? It's a little confusing. Here's what Apple says:


  When Time Zone Support is on, Calendar displays event dates and times in the time zone set for your calendars. When Time Zone Support is off, Calendar displays events in the time zone of your current location.