A display-card is disclosed for time management purpose, including a display; a clock defining a current date and time; a memory; an internal power supply; and a communication device. The memory includes a user identifier, setup information and time information. The time information includes at least a current time counter and a status information defining an active or an inactive state, the active state enabling the update with the clock of the current time counter and the inactive state disabling the update of the current time counter. The display-card further includes a receiver/transmitter to receive, via the communication device, a command to initiate the change of the status information from active to inactive state, or inactive to active state, and an actuator to initiate the display of at least the current time counter.