YSK that if you set a reminder on your iPhone then the reminder is set for the time zone you scheduled it in and won't change if you are in a different time zone when it is supposed to go off.

For example, if you're in California (PST) on Monday and set a reminder for a 9am meeting on Friday in NYC (EST) while still in California then the reminder will go off at 12(EST) / 9am(PST)