i'm confused, what's wrong there? event starts at departure time and goes for duration. the arrival time is correct, and can be reported in any time zone.
Sorry for not being detailed in my comment. Or i might have butchered. I will simply explain with numbers.
Email said, flight departs 31st March 9pm.
Flight duration 15 hours.
Flight reaches Apr 1st. 9pm. No indication of timezones, but as super common in flights, all times are local. Both cities have about 12 hour difference.
Google thought Departure 31st March (correct);
Duration 15 hours (correct).
Arrival Apr 2nd, 12pm. (Not correct, it added 15 hours duration to Arrival city time. Apr 1 9pm + 15 hours = this).
