Time management device, time management method of time management device, time management program and time management system of time management device

摘要

PROBLEM TO BE SOLVED: To provide a time management device, a time management method and a time management program for appropriately managing materials even in a non-communication environment in which wireless communication cannot be established. SOLUTION: In a time management device, a method determines whether or not it is in a communication environment, and if it is in a communication environment, the usable time of a plurality of materials after being manufactured, and after opening after being opened. It manages the usable time and the usable time that can be used for construction using usable materials, and when the time management device moves from the communication environment to the non-communication environment, the materials that are ready for use are selected. The start time and end time of the construction used are recorded, the availability of the material is judged based on the construction time and usable time, the usable time after opening, or the usable time, and the judgment result is output. Further, when the non-communication environment is restored to the communication environment, the construction start time and the construction end time recorded in the non-communication environment are transmitted to the information processing apparatus. [Selection diagram] Fig. 4