Control Servos DateTime Alarm

I know how to control a regular servo that rotates, but how can I control a linear servo? For example tell it to start at a certain position, go to another and come back. I was looking at using the L12 servo from firgelli to do this. I would like this process to happen twice a day. I heard that there is a time keeping feature in Arduino to synchronize it with a PC but the problem if the Arduino got reset the time changes. I wanted something reliable to extract the time every time and trigger the function that causes the actuator to move I would appreciate if someone could give some insight and help on this. Thanks

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Thank you. Moderator