calendarcontactsios
I have entered the birthday for several of my Contacts, and these birthdays show up in Calendar. I know that I can enable or disable all birthdays by selecting or deslecting "Birthdays" from Show Calendars in the top corner of the Calendar app. But I only want to see some of my contact's birthdays in the Calendar; for example, personal contacts but not ex-coworkers.
How can I prevent the display of certain birthdays?
On the mac, turn off Birthday calendars in the Calendar app preferences.
On the iOS device, unselect the check next to the programmatic calendar to suppress those entries. Short of jailbreaking the device and patching the Calendar app, you can't suppress the package calendar - just show or hide it.
Alternatively, you could purge all birthdays and anniversaries from all Contacts, but that seems too brute force to me when you can suppress each calendar with settings. Most that I have asked choose either the OS X calendar and suppress the iOS one or skip the OS X one and rely only on iOS for birthdays and anniversary entries.
I was having a similar issue for a while using the native Birthday calendar. It's not exactly the same as only the notifications came in one day early.
To fix this, in macOS El Capitan with Calendar v8.0 (2092.3), I found the following:
I looked for this option a while ago but was unable to find it earlier. But now with this, I'm neatly notified on the day of a birthday. Perhaps it helps others as well.
Best Answer
You could edit out the birthdate information from those contacts you do not want to see in the Birthdays calendar.
Another way to accomplish this would be by manually adding the birthdays you do want to see to a new or existing calendar and then disable the Birthdays subscription.