I set the calendar public & got the xml feed & created 2 events...neither one show up. It's telling me:
Can't create the events list. Check your options.
The code you have for time/date doesn't match my WordPress. I tried to change yours to match mine & it still don't help. Also my WordPress is currently at UTC-5 due to Daylight Savings time. But I'd normally be UTC-6. I tried to change Google's calendar to UTC-5 & that didn't help either.
I'm using WordPress MU 2.9.2 if that helps.