It sounds like you're describing an app that functions like a virtual assistant, where it not only stores your calendar or diary entries but also reminds you verbally, based on specific dates and times. This AI-powered reminder would speak to you, offering timely and personal reminders for appointments, tasks, or events.

Such an app could integrate:

• Voice Notifications: The app would notify you verbally at the exact time you set, reading out reminders like, "Don't forget your meeting with Jane at 3 PM" or "It's time for your workout!"
• Natural Language Understanding: The AI could recognize your diary or to-do list entries and adapt to your tone and needs, ensuring you get reminders in a way that’s easy to digest.
• Calendar Integration: Syncing with Google Calendar, Apple Calendar, or any other platform to fetch upcoming events.
• Customizable Voice & Reminders: Options to choose from different voices or even set personalized messages.
• Location-Based Reminders: Reminding you to pick up groceries, for instance, when you're near a store.