What does that mean?
The one that you write based in your requirements. The forum will help you, but not write the whole code for you.
You will need a basic Arduino like Nano V3, and a Real Time Clock module. I would recommend one that uses DS3231 chip. For the LCD, a basic 16x2 character display should be sufficient and I recommend to get one with an i2c backpack pre-soldered to the display, for easy connection.