Integer (read only)
Specifies the expiration date of a world.
This attribute is new in version 3.1 and requires at least build 18 of the SDK and build 28 of the world server.
If this attribute is zero, the world does not expire.
The time is given in the same format as the other timestamps used throughout the SDK: the number of seconds elapsed since midnight, January 1, 1970, Coordinated Universal Time. This format is also used by the time() system call.