How to make an Arduino perform a task at a given time?

Question

Arduino

There is a simple stepper motor with ULN2003 driver , arduino nano and DS3231 precise time module .
Task: start the engine several times a day at the specified hours, for example at 12, 13 and 21.
I hope to find a solution using the DS3231 module .
The option with delay does not suit you, since you have to catch timings when you turn on / off the device.

Answer 1

It is necessary to read the time once a second and check compliance with the conditions.

Answer 2

it is possible to do an initial rename with unix time. then convert to normal time and watch

Answer 3

1. Read the time.
2. If current time = action execution time, then perform the action...
Or write the code for you?