The digital control clocks of the ZCM-32 series are used to perform time functions in automation and control systems. Turning on / off the device is associated with sunrise and sunset (official dawn and dusk). In the calculations of sunrise and sunset time, information about the geographical coordinates of the place where the clock is installed, the current date and the offset from universal time are used. The system calculates the so-called official sunrise and sunset times, i.e. the phase when the upper edge of the solar disk touches the horizon. The system has two independent channels (outputs). The function of night pause and offset of calculated sunrise / sunset time within ± 120 min can be programmed for each channel. The housing design enables mounting the system on a DIN rail and possibly sealing the device. The design of the system guarantees battery backup of all settings in the absence of power supply.