Programmable air conditioning thermostat

Hi! I´m a beginner (from zero)

I would like to know what pieces I need to make a programmable air conditioning thermostat.

Program must be 2 events per day, five weekdays, override weekend.

I have an UNO board, a two relays shield, a HDT11 sensor, a display and wires.

Once finished, the purpose is to connect A/C unit's terminals to the relays.

I'll appreciate your help on this.

Looks like you have everything you need with the possible exception of a keypad to let a user set the temperatures and times and a real time clock module so you know when to turn stuff on and off. You should be able to find example code for your DHT11 easily enough. Same thing for a clock module. Combine them and you'll be most of the way there.