System and method for granting access to or for starting an object

A system comprising:

• a portable electronic device,
• an object, and
• a backend device,
• wherein the portable electronic device is configured to send a virtual key to the object, wherein the virtual key is valid for a predefined period of time and includes information about the predefined period of time;
• wherein the object is configured to receive the virtual key from the portable electronic device, and compare the information about the predefined period of time with an internal clock, wherein the object may be opened or started when the virtual key is determined to be valid at a time of receipt of the virtual key;
• wherein the object is configured to, before comparing the information about the predefined period of time with an internal clock, send a second request message to the portable electronic device;
• wherein the portable electronic device is configured to send a first request message to the backend device upon receipt of the second request message from the object;
• wherein the backend device is configured to read an internal device clock and send a first response message to the portable electronic device upon receipt of the first request message, wherein the first response message comprises information about present internal device time;
• and
• wherein the portable electronic device is further configured, upon receipt of the first response message, to at least one of:
• update an internal clock of the portable electronic device with the present internal device time, and
• send a second response message to an object, wherein the second response message comprises information about the present internal device time.