iPhone: how to change birthday alert time (9:00 a.m. by default)

Hi,

First please excuse my very poor English.

I added birthdays to iCal and then I modified them to alert me at 11:00 a.m., it´s great to know how old are people before you ring or text them 😀

Via iCloud the synchronization was correct between my Mac´s iCal and my iPhone, now the iPhone alerts me but I don´t know how to change the hour.

I look for it on "Settinggs -> Mail, Contacts, Calendars -> Calendars" and there I can see "Default Alert Times".

There I can choice:

None

On day of event (9:00)

1 day before event (9:00)

2 days before event (9:00)

1 week before

Nine o´clock is not so bad, but on hollidays, week-ends or special days maybe a little soon, and I don´t know how to change this "Default alert times".

Same thing on "All-Day Events", but I don´t care as I care for "birthdays".

Thanks a lot for your time,

JR Baz