TIMESTAMP - Global time data container
typedef int64 TIMESTAMP;
The value of NEVER is a very large positive integer.
The value of INVALID is -1;
The value of ZERO is 0 and represents an uninitialized value.
The value of INIT is 0 and represents an uninitialized value.
The TIMESTAMP structure is used to store globals times. Global times are always stored in seconds since January 1, 1970 00:00:00 UTC. Local times stored in DATETIME structures are different from global times because local times consider timezone and daylight-savings/summer time offsets.