S Planner: Settings: Set default reminders

A

AC Question

Hi!

I have Samsung Galaxy J5. I use the S Planner builtin app. I have entered my Google account and it syncs with my Google Calendar. I have added Facebook Birthdays there. In S Planner, all the Facebook birthdays are displayed correctly. I have set in S Planner, to have default reminders: For All-day events: Day before event at 17:00.
Problem is that for example, I had a birthday on Monday, but my phone did not remind me of this birthday. What is happening? Am i doing something wrong?