I have been able to subscribe to the iCal feed of a Zoho Creator view in Google Calendar and the events appear at the correct times. (That said, the feed is very infrequently refreshed by GCal, which makes it next to useless for our needs, but I assume that is not something within Zoho's control.)
However, subscribing to the same Zoho Creator iCal feed directly in the iPhone Calendar app results in the events all being displayed 10 hours behind where they should be (i.e. UTC instead of UTC +10). I have tried changing the local timezone settings in the iphone just as a test but it makes no difference what it is set to.
How can we get the iCal feeds working on the iPhone?