[bergman]

The calendar alerts (appointment reminders) in iOS don't meet my needs. The choice of "1 day in advance" doesn't meet my needs when I want a reminder the night before, such as 10 hours in advance. Interestingly, since my calendar is actively sync'd with Outlook, I can set the alert to 10 hours in OUtlook and it will show up displayed as such on the iPhone and iPad.
Is there any workaround from the UI on the iPhone to set custom alert times?

[Entertainment72]

I can set up calendar alerts 5,15,30 minutes - 1,2 hrs or 1,2 days before event. Not sure why that is the only choice you see.

[bergman]

I see all the options mentioned by Entertainment72, but I am limited to those options. I want more options.

[Alli]

Use a 3rd party calendar, like CalenGoo and open yourself to more functionality.