Abstract: A display device includes at least one processor and a display. The processor acquires one or a plurality of pieces of schedule information each including information of a starting time and information of an ending time and causes the display to display a time remaining between a present time and the starting time or a time remaining between the present time and the ending time.

Abstract: A smartphone includes at least one processor. The processor acquires, from a time display device, log data of the time display device, and determines, based on the acquired log data and with an input command from a user received by the smartphone as a trigger, a status of whether the time display device is abnormal.

Abstract: A display device includes at least one processor. The processor acquires a plurality of pieces of schedule information each including information of a starting time and information of an ending time. When first schedule information and second schedule information, respective periods of which at least partially overlap each other, each period ranging from the starting time to the ending time, exist, the processor selects one piece of schedule information out of the first schedule information and the second schedule information, based on the starting time or the ending time set to each piece of the first schedule information and the second schedule information. The processor executes display based on the selected schedule information.

Abstract: A display device includes at least one processor and a display. The processor acquires one or a plurality of pieces of schedule information each including information of a starting time and information of an ending time and causes the display to display a time remaining between a present time and the starting time or a time remaining between the present time and the ending time.