About the time interrupt in Arduino

I am currently trying to write the code which while all my temp and humid sensors are running in forever, the water pump will automatically turn on for 12 hrs, turn off for 12 hr and turn on 12 hrs again (form a loop of turn on and off). However, I can only allow my water pump to turn on for a certain time and turn off forever when the relay goes from turn on to turn off
Here is my code:
XGpioPs_WritePin(&output, 13 ,0);
xil_printf("Water Pump On\n\r");
} else
XGpioPs_WritePin(&output, 13 ,1);
xil_printf("Water Pump Off\n\r");
I don't how to change it.

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Please show your Arduino code. Arduino code is C/C++ code. All C/C++ code must be in a function and all Arduino code must be in setup() and loop() functions (although there are exceptions that don't apply here) . This code is not in ANY function.

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