How to Change Default Alert Times in Calendars for iPhone & iPad, Birthdays & Events
You can change the default alert times of calendar events on iPhone and iPad.
Forgetting a birthday or an important event never feels good, and if you have a habit of either completely forgetting dates or not remembering until it’s too late, you can adjust the default alert times settings in iOS to better correspond to your needs and level of forgetfulness. You may have noticed that iOS has no standard alert time for events and birthdays, but through a settings change and give yourself one of four options: an alert on the day of the event at 9AM, an alert a day before the event, two days before the event, or a week before.